Floretyrosine F 18

 

Floretyrosine F 18

CAS 178433-03-9

FormulaC₁₁H₁₄[¹⁸F]NO₃

Molecular Weight226.23 g/mol

FDA UNII1326R5J1IA

FDA 2026, APPROVALS 2026, Pixclara, TELIX PHARMACEUTICALS, GLIOMA, CANCER, TLX101-CDx, TLX101-Px, 1326R5J1IA, L-(18F)FET, O-(2-((18)F)fluoroethyl)-L-tyrosine

(2S)-2-amino-3-[4-(2-[¹⁸F]fluoroethoxy)phenyl]propanoic acid, (2S)-2-amino-3-[4-(2-(¹⁸F)fluoroethoxy)phenyl]propanoic acid

To use with positron emission tomography to differentiate recurrent or progressive glioma from treatment-related change in conjunction with other diagnostic evaluations

Floretyrosine F 18 (brand name Pixclara®, also known as 18F-FET) is a newly FDA-approved radiopharmaceutical imaging drug used in positron emission tomography (PET) scans for patients with glioma (brain cancer). Developed by Telix Pharmaceuticals, it received formal U.S. Food and Drug Administration (FDA) approval on September 14, 2026, making it the first and only approved FET-PET diagnostic tracer for brain tumors in the United States.

Primary Clinical Indication

Pixclara is indicated for use in both adult and pediatric patients (1 month of age and older).

Its primary clinical purpose is to differentiate recurrent or progressive glioma from treatment-related changes (such as radiation necrosis or inflammation). Following chemotherapy or radiation, traditional MRI scans often show areas that "light up," making it incredibly difficult for neuro-oncologists to tell whether a tumor is growing back or if the brain is simply healing from harsh treatments. Pixclara solves this diagnostic dilemma by providing metabolic clarity.

How It Works (Mechanism of Action)

• Targeted Delivery: Floretyrosine F 18 is a synthetic amino acid analogue labeled with the radioactive isotope fluorine-18. [1, 2]
• Cellular Uptake: Once injected intravenously, it specifically targets and binds to L-type amino acid transporters 1 and 2 (LAT1 and LAT2). These transporters are heavily overexpressed on the membranes of active glioma cells compared to healthy brain tissue.
• PET Detection: The tumor cells rapidly absorb the tracer, and the energy emissions from the fluorine-18 isotope are captured by a PET scanner, creating a highly accurate metabolic map of the tumor.

Strategic & Future Impact

The approval aligns U.S. practice with international clinical guidelines—such as the National Comprehensive Cancer Network (NCCN) Guidelines®—which already recommend FET-PET imaging for brain tumor management. Furthermore, Telix Pharmaceuticals is currently conducting a Phase 3 registrational study to expand Pixclara’s indication to include the diagnosis and characterization of brain metastases (cancers that have spread to the brain from other parts of the body)

Fluoroethyl-l-tyrosine (¹⁸F), commonly known as [¹⁸F]FET, is a radiopharmaceutical tracer used in positron emission tomography (PET) imaging. This synthetic amino acid, labeled with the radioactive isotope fluorine-18, is a valuable radiopharmaceutical tracer for use in neuro-oncology for diagnosing, planning treatment, and following up on brain tumors such as gliomas. The tracer's ability to provide detailed metabolic imaging of tumors makes it an essential tool in the clinical management of brain cancer patients. Continued advancements in PET imaging technology and the development of more efficient synthesis methods are expected to further enhance the clinical utility of [¹⁸F]FET.^[2]

Radiosynthesis

There are two common pathways for the radiosynthesis of [¹⁸F]FET. The first one utilizes a nucleophilic ¹⁸F-fluorination of ethyleneglycol-1,2-ditosylate with a subsequent ¹⁸F-fluoroethylation of a precursor di-sodium salt of L-tyrosine. This sequence requires two purification steps, two different precursors and a dual-reactor synthesis module which is not widely available in research or commercial centers.^[3][4][5] The schematic for this pathway is:^[6]

Figure 1. Schematic of radiosynthesis using two-step two-pot pathway.

The second route of radiosynthesis is a direct nucleophilic ¹⁸F-fluorination a TET (O-(2-tosyloxy-ethyl)-N-trityl-L-tyrosine tert-butyl ester) protected precursor followed by acidic hydrolysis of protecting groups.^[3][4][7] The schematic for this pathway is:^[6]

REF

• Fluorinated phenylalanines: synthesis and pharmaceutical applicationsPublication Name:Beilstein Journal of Organic ChemistryPublication Date:2020-05-15PMCID:PMC7237815PMID:32509033DOI:10.3762/bjoc.16.91
• Solid-Phase Synthesis of O-(2-[18F]-Fluoro-ethyl)-l-tyrosinePublication Name:SynfactsPublication Date:2013-03-15DOI:10.1055/s-0032-1318420
• Investigations into the synthesis, radiofluorination and conjugation of a new [18F]fluorocyclobutyl prosthetic group and its in vitro stability using a tyrosine model systemPublication Name:Bioorganic & Medicinal ChemistryPublication Date:2013-02-01PMID:23290251DOI:10.1016/j.bmc.2012.11.049
• Microfluidic technology: An economical and versatile approach for the synthesis of O-(2-[18F]fluoroethyl)-l-tyrosine ([18F]FET)Publication Name:Bioorganic & Medicinal Chemistry LettersPublication Date:2012-03-15PMID:22342141DOI:10.1016/j.bmcl.2012.01.083
• Synthesis and biological evaluation of novel F-18 labeled pyrazolo[1,5-a]pyrimidine derivatives: Potential PET imaging agents for tumor detectionPublication Name:Bioorganic & Medicinal Chemistry LettersPublication Date:2011-08-15PMID:21752641DOI:10.1016/j.bmcl.2011.06.072
• (18)F Labeled benzimidazole derivatives as potential radiotracer for positron emission tomography (PET) tumor imagingPublication Name:Bioorganic & Medicinal ChemistryPublication Date:2010-04-01PMID:20303769DOI:10.1016/j.bmc.2010.02.060
• No carrier added synthesis of O-(2′-[18F]fluoroethyl)-l-tyrosine via a novel type of chiral enantiomerically pure precursor, NiII complex of a (S)-tyrosine Schiff basePublication Name:Bioorganic & Medicinal ChemistryPublication Date:2008-05-01PMID:18378460DOI:10.1016/j.bmc.2008.03.040
• Solid-Phase Synthesis of O-(2-[18F]-Fluoro-ethyl)-l-tyrosine, DOI:10.1055/s-0032-1318420, Publication Date:2013, Publication Name:Synfacts

SYN

US20190223814/US249082034

https://patentscope.wipo.int/search/en/detail.jsf;jsessionid=7C55DB9EE5B2E59D667F3571B796AE12.wapp1nB?docId=US249082034&_cid=P11-MU3HKD-32540-1

PAT

 US20120189546

https://patentscope.wipo.int/search/en/detail.jsf?docId=US73636763&_cid=P11-MU3HO5-37901-1

PAT

US20140235861

https://patentscope.wipo.int/search/en/detail.jsf?docId=US107206441&_cid=P11-MU3HO5-37901-1

Another example of an ¹⁸F-fluoroalkylation reaction to obtain a PET tracer is the reaction described by Wang et al (2006 J Radioanalyt Nuc Chem; 270(2): 439-43) used to obtain the ¹⁸F-labeled amino acid O-(2-[ ¹⁸F]fluoroethyl)-L-tyrosine ([ ¹⁸F]FET):

  [ ¹⁸F]Fluoroethyl tosylate was prepared in step (i) by displacement of a tosyl group from 1,2-bistosyloxyethane by reaction with K ¹⁸F/Kryptofix 2.2.2 in acetonitrile at 90° C. for 10 minutes. The purified [ ¹⁸F]fluoroethyl tosylate was then reacted in step (ii) with a solution of L-tyrosine and 10% aqueous NaOH in DMSO (or di-Na-salt of L-tyrosine in DMSO) 20 minutes at 90° C. to obtain [ ¹⁸F]FET. In contrast to the method for preparation of ¹⁸F-labelled S-fluoroalkyl diarylguanidines as reported by Robins et al (supra), this method for preparation of [ ¹⁸F]FET uses a soluble base in the alkylation reaction. However, the reaction is still not ideal for carrying out on an automated synthesis device that uses a cassette due to the fact that and additional vial is required for the base used for the subsequent fluoroalkylation step.

PAT

Radiation radiation detector with position tracking system and its use in medical systems and proceduresPublication Number:

JP-2004512502-APriority Date:2000-08-21

• Novel imaging agents and precursors and methods of preparation thereofPublication Number:CN-1234680-CPriority Date:2001-06-04Grant Date:2006-01-04
• Radioactive emission detector equipped with a position tracking system and utilization thereof with medical systems and in medical proceduresPublication Number:US-2005055174-A1Priority Date:2000-08-21
• Radioactive emission detector equipped with a position tracking system and utilization thereof with medical systems and in medical proceduresPublication Number:US-7826889-B2Priority Date:2000-08-21Grant Date:2010-11-02
• Radioactive emission detector equipped with a position tracking system and utilization thereof with medical systems and in medical proceduresPublication Number:US-2004015075-A1Priority Date:2000-08-21
• Radioactive emission detector equipped with a position tracking systemPublication Number:US-2014249402-A1Priority Date:2000-08-21
• Tumor imaging compoundsPublication Number:CA-2479514-CPriority Date:2002-04-30Grant Date:2011-07-26
• Protected tyrosine derivatives, method for the production thereof and use of the same for producing o-(2-[18f]-fluoroethyl)-l-tyrosinePublication Number:WO-02102765-A3Priority Date:2001-06-05
• Protected tyrosine derivatives, method for the production thereof and use of the same for producing o-(2-[18f]-fluoroethyl)-l-tyrosinePublication Number:US-2004192954-A1Priority Date:2001-06-05
• PROTECTED TYROSINE DERIVATIVES, METHOD FOR THE PRODUCTION THEREOF AND THEIR USE FOR THE PRODUCTION OF O-(2-?18 F)-FLUORETHYL)-L-TYROSINEPublication Number:AT-E289992-T1Priority Date:2001-06-05Grant Date:2005-03-15
• Imaging agents, precursors thereof and methods of manufacturePublication Number:US-2003124059-A1Priority Date:2001-06-04
• Radioactively labelled amino acid analogues, their preparation and usePublication Number:US-2006127306-A1Priority Date:2002-08-02
• Radioactively labelled amino acid analogues, their preparation and usePublication Number:EP-1539250-A1Priority Date:2002-08-02
• Tumor imaging compoundsPublication Number:US-7989649-B2Priority Date:2002-04-30Grant Date:2011-08-02
• Tumor imaging compoundsPublication Number:US-2009240041-A1Priority Date:2002-04-30
• Tumor imaging compoundsPublication Number:US-7544715-B2Priority Date:2002-04-30Grant Date:2009-06-09

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References

1.  CID 54255856 from PubChem
2.  Treglia G, Muoio B, Giovanella L (2020). "¹⁸F-FET". In Calabria F, Schillaci O (eds.). Radiopharmaceuticals: A Guide to PET/CT and PET/MRI. Cham: Springer International Publishing. pp. 83–88. doi:10.1007/978-3-030-27779-6_4. ISBN 978-3-030-27778-9.
3.  Bourdier T, Greguric I, Roselt P, Jackson T, Faragalla J, Katsifis A (July 2011). "Fully automated one-pot radiosynthesis of O-(2-[18F]fluoroethyl)-L-tyrosine on the TracerLab FX(FN) module". Nuclear Medicine and Biology. 38 (5): 645–651. doi:10.1016/j.nucmedbio.2011.01.001. PMID 21718939.
4.  Siddiq IS, Atwa ST, Shama SA, Eltaoudy MH, Omar WM (March 2018). "Radiosynthesis and modified quality control of O-(2-[¹⁸F]fluoroethyl)-L-tyrosine ([¹⁸F]FET) for brain tumor imaging". Applied Radiation and Isotopes. 133: 38–44. Bibcode:2018AppRI.133...38S. doi:10.1016/j.apradiso.2017.12.011. PMID 29275040.
5.  Wester HJ, Herz M, Weber W, Heiss P, Senekowitsch-Schmidtke R, Schwaiger M, et al. (January 1999). "Synthesis and radiopharmacology of O-(2-[18F]fluoroethyl)-L-tyrosine for tumor imaging". Journal of Nuclear Medicine. 40 (1): 205–212. PMID 9935078.
6.  Wang M, Glick-Wilson BE, Zheng QH (December 2019). "Facile fully automated radiosynthesis and quality control of O-(2-[¹⁸F]fluoroethyl)-l-tyrosine ([¹⁸F]FET) for human brain tumor imaging". Applied Radiation and Isotopes. 154 108852. Bibcode:2019AppRI.15408852W. doi:10.1016/j.apradiso.2019.108852. PMID 31442794.
7.  Mueller D, Klette I, Kalb F, Baum RP (July 2011). "Synthesis of O-(2-[18F]fluoroethyl)-L-tyrosine based on a cartridge purification method". Nuclear Medicine and Biology. 38 (5): 653–658. doi:10.1016/j.nucmedbio.2011.01.006. PMID 21718940.
8.  Muoio B, Giovanella L, Treglia G (2018-09-04). "Recent Developments of 18F-FET PET in Neuro-oncology". Current Medicinal Chemistry. 25 (26): 3061–3073. doi:10.2174/0929867325666171123202644. PMID 29173147.
9.  Wang L, Lieberman BP, Ploessl K, Kung HF (January 2014). "Synthesis and evaluation of ¹⁸F labeled FET prodrugs for tumor imaging". Nuclear Medicine and Biology. 41 (1): 58–67. doi:10.1016/j.nucmedbio.2013.09.011. PMC 3895945. PMID 24183614.
10.  Lee TS, Ahn SH, Moon BS, Chun KS, Kang JH, Cheon GJ, et al. (August 2009). "Comparison of 18F-FDG, 18F-FET and 18F-FLT for differentiation between tumor and inflammation in rats". Nuclear Medicine and Biology. 36 (6): 681–686. doi:10.1016/j.nucmedbio.2009.03.009. PMID 19647174.
11.  Leung K (2004), "O-(2-[18F]Fluoroethyl)-L-tyrosine", Molecular Imaging and Contrast Agent Database (MICAD), Bethesda (MD): National Center for Biotechnology Information (US), PMID 20641653, retrieved 2024-07-10
12.  Heiss P, Mayer S, Herz M, Wester HJ, Schwaiger M, Senekowitsch-Schmidtke R (August 1999). "Investigation of transport mechanism and uptake kinetics of O-(2-[18F]fluoroethyl)-L-tyrosine in vitro and in vivo". Journal of Nuclear Medicine. 40 (8): 1367–1373. PMID 10450690.
13.  Wang HE, Wu SY, Chang CW, Liu RS, Hwang LC, Lee TW, et al. (May 2005). "Evaluation of F-18-labeled amino acid derivatives and [18F]FDG as PET probes in a brain tumor-bearing animal model". Nuclear Medicine and Biology. 32 (4): 367–375. doi:10.1016/j.nucmedbio.2005.01.005. PMID 15878506.
14.  Rau FC, Weber WA, Wester HJ, Herz M, Becker I, Krüger A, et al. (August 2002). "O-(2-[(18)F]Fluoroethyl)- L-tyrosine (FET): a tracer for differentiation of tumour from inflammation in murine lymph nodes". European Journal of Nuclear Medicine and Molecular Imaging. 29 (8): 1039–1046. doi:10.1007/s00259-002-0821-6. PMID 12173018.
15.  Holzgreve A, Brendel M, Gu S, Carlsen J, Mille E, Böning G, et al. (2016-06-14). "Monitoring of Tumor Growth with [(18)F]-FET PET in a Mouse Model of Glioblastoma: SUV Measurements and Volumetric Approaches". Frontiers in Neuroscience. 10: 260. doi:10.3389/fnins.2016.00260. PMC 4906232. PMID 27378835.
16.  "Product Characteristic of IASOglio©" (PDF). synektik.com.pl. 28 June 2024. Retrieved 28 June 2024.
17.  Pauleit D, Floeth F, Herzog H, Hamacher K, Tellmann L, Müller HW, et al. (April 2003). "Whole-body distribution and dosimetry of O-(2-[18F]fluoroethyl)-L-tyrosine". European Journal of Nuclear Medicine and Molecular Imaging. 30 (4): 519–524. doi:10.1007/s00259-003-1118-0. PMID 12589478.
18.  Tang G, Tang X, Wang M, Luo L, Gan M (January 2004). "Radiation dosimetry of O-(3-[18F]fluoropropyl)-L-tyrosine as oncologic PET tracer based on the mice distribution data". Applied Radiation and Isotopes. 60 (1): 27–32. doi:10.1016/j.apradiso.2003.10.005. PMID 14687633.
19.  Mattsson S, Johansson L, Leide Svegborn S, Liniecki J, Noßke D, Riklund KÅ, et al. (July 2015). "Radiation Dose to Patients from Radiopharmaceuticals: a Compendium of Current Information Related to Frequently Used Substances" (PDF). Annals of the ICRP. 44 (2 Suppl): 7–321. doi:10.1177/0146645314558019. PMID 26069086.
20.  "IASOglio". Curium Pharma. Retrieved 2024-07-10.

Clinical data
Other names	18F-FET; O-(2-(18F)fluoroethyl)-l-tyrosine, O-(2-Fluorethyl)-l-thyrosine, l-(18F)FET[1]
Routes of administration	Intravenous
ATC code	V09IX10 (WHO)
Identifiers
IUPAC name
CAS Number	178433-03-9
PubChem CID	9834479
ChemSpider	8010200
UNII	1326R5J1IA
CompTox Dashboard (EPA)	DTXSID601045942
Chemical and physical data
Formula	C11H14FNO3
Molar mass	227.235 g·mol−1
3D model (JSmol)	Interactive image
SMILES
InChI

///////////floretyrosine F 18, anax labs, FDA 2026, APPROVALS 2026, Pixclara, TELIX PHARMACEUTICALS, GLIOMA, CANCER, TLX101-CDx, TLX101-Px, 1326R5J1IA, L-(18F)FET, O-(2-((18)F)fluoroethyl)-L-tyrosine

#floretyrosine F 18, #anax labs, #FDA 2026, #APPROVALS 2026, #Pixclara, #TELIX PHARMACEUTICALS, #GLIOMA, #CANCER, #TLX101-CDx, #TLX101-Px, #1326R5J1IA, #L-(18F)FET, #O-(2-((18)F)fluoroethyl)-L-tyrosine

Setomagpran

 

Setomagpran

CAS 2991434-57-0

MF C22H19Cl2F6N5O MW 554.316

3-chloro-N-[(1R,3S)-3-{[6-chloro-2-(trifluoromethyl)quinolin-4-yl]amino}cyclohexyl]-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxamide

1H-Pyrazole-4-carboxamide, 3-chloro-N-[(1R,3S)-3-[[6-chloro-2-(trifluoromethyl)-4-quinolinyl]amino]cyclohexyl]-1-(2,2,2-trifluoroethyl)-

3-chloro-N-[(1R,3S)-3-{[6-chloro-2-(trifluoromethyl)quinolin-4-yl]amino}cyclohexyl]-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxamide
Mas-related G protein-coupled receptor antagonist, anti-inflammatory, MYX4KT647F

Setomagpran is a synthetic, small-molecule antagonist of the Mas-related G protein-coupled receptor X2 (MRGPRX2).

Because it blocks this specific receptor, it exhibits notable anti-inflammatory activity. The compound is primarily utilized as a reference standard and biochemical reagent in laboratory research settings

Setomagpran is the antagonist for mas-related G protein-coupled receptor (MRGPR), and exhibits anti-inflammatory activity.

Pat

https://patentscope.wipo.int/search/en/detail.jsf;jsessionid=D6A76F8C817A36064EC940AFD0940B3B.wapp1nA?docId=US447185480&_cid=P10-MU0M8Q-83999-1

Example 30

Synthesis of Example 30

Synthesis of 3-chloro-N-((1R,3S)-3-((6-chloro-2-(trifluoromethyl)quinolin-4-yl)amino) cyclohexyl)-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxamide

To a stirring solution of ethyl 3-chloro-1H-pyrazole-4-carboxylate (200 mg, 1 Eq, 1.15 mmol) in DMF (5 mL) at room temperature was added cesium carbonate (1.12 g, 3 Eq, 3.44 mmol) portionwise over 2 minutes. After stirring for 30 minutes, 22,2-Trifluoroetiyl tiifluoromethanesuilfonate (798 mg, 3 Eq, 3.44 mmol) was added dropwise over 2 minutes. The reaction mixture was stirred for 14 h. Water (5 mL) was added and the mixture was extracted with EtOAc (3×5 mL), dried over sodium sulfate, filtered through Celite, and concentrated in vacuo to afford an 87:13 mixture of ethyl 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate and ethyl 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate that was used without further purification.

To a stirring solution of the crude ethyl 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate and 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate mixture (294 mg, 1 Eq, 1.15 mmol) in THF (6 mL) was added an aqueous solution of 1M sodium hydroxide (5.7 mL, Eq, 5.73 mmol). The reaction mixture was heated at 50° C. for 14 h. 10 mL of 3 M HCl was added. The aqueous layer was extracted with EtOAc (3×10 mL), dried over sodium sulfate, filtered through Celite, and concentrated in vacuo to afford a mixture of 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid and 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid (276 mg, 1.21 mmol, 105%) that was used without further purification.

To a stirring solution of (1S,3R)-N1-(6-chloro-2-(trifluoromethyl)quinolin-4-yl)cyclohexane-1,3-diamine hydrochloride (100 mg, 1 Eq, 0.264 mmol) in DMF (1.5 mL) were added a crude mixture of 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid and 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid (60 mg, 1 Eq, 0.264 mmol), N-ethyl-N-isopropylpropan-2-amine ( DIPEA) (0.138 mL, 3 Eq, 0.793 mmol) and HATU (111 mg, 1.1 Eq, 0.291 mmol). The reaction mixture was stirred at room temperature for 2 h. Purification by reversed phase HPLC (35□55% 0.1% formic acid in MeCN and 0.1% formic acid in H 2O) afforded 3-chloro-N-((1R,3S)-3-((6-chloro-2-(trifluoromethyl)quinolin-4-yl)amino)cyclohexyl)-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxamide (69 mg, 47% yield).

LCMS-ESI (m/z) calculated: 553.09 found 553.8 [M+H] +, RT=10.114 min (Method 1)

1H NMR (400 MHz, DMSO-d6) δ 8.60 (d, J=10.9 Hz, 1H), 8.35 (s, 1H), 8.06 (d, J=7.9 Hz, 1H), 7.90 (d, J=9.0 Hz, 1H), 7.74 (dd, J=9.0, 2.3 Hz, 1H), 7.48 (d, J=7.9 Hz, 1H), 5.21 (q, J=9.0 Hz, 1H), 4.01-3.83 (m, 2H), 2.17 (d, J=12.0 Hz, 1H), 2.00-1.78 (m, 3H), 1.61-1.21 (m, 4H).

Pat

WO 2022/067094 A1 (US20220098155)

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2022067094&_cid=P10-MTZI7E-88068-1

PAT

WO 2023/192901 A1

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2023192901&_cid=P10-MTZIR9-08517-1

EXAMPLE 30

Synthesis of 3-chloro-N-((1R,3S)-3-((6-chloro-2-(trifluoromethyl)quinolin-4-yl)amino) cyclohexyl)-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxamide

To a stirring solution of ethyl 3-chloro-1H-pyrazole-4-carboxylate (200 mg, 1 Eq, 1.15 mmol) in DMF (5 mL) at room temperature was added cesium carbonate (1.12 g, 3 Eq, 3.44 mmol) portionwise over 2 minutes. After stirring for 30 minutes, 2,2,2- Trifluoroethyl trifluoromethanesulfonate (798 mg, 3 Eq, 3.44 mmol) was added dropwise over 2 minutes. The reaction mixture was stirred for 14 h. Water (5 mL) was added and the mixture wasextracted with EtOAc (3 x 5 mL), dried over sodium sulfate, filtered through Celite, and concentrated in vacuo to afford an 87:13 mixture of ethyl 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate and ethyl 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate that was used without further purification.

To a stirring solution of the crude ethyl 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate and 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylate mixture (294 mg, 1 Eq, 1.15 mmol) in THF (6 mL) was added an aqueous solution of 1M sodium hydroxide (5.7 mL, 5 Eq, 5.73 mmol). The reaction mixture was heated at 50 °C for 14 h. 10 mL of 3 M HCl was added. The aqueous layer was extracted with EtOAc (3 x 10 mL), dried over sodium sulfate, filtered through Celite, and concentrated in vacuo to afford a mixture of 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid and 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid (276 mg, 1.21 mmol, 105 %) that was used without further purification.

To a stirring solution of (1S,3R)-N1-(6-chloro-2-(trifluoromethyl)quinolin-4-yl)cyclohexane-1,3-diamine hydrochloride (100 mg, 1 Eq, 0.264 mmol) in DMF (1.5 mL) were added a crude mixture of 3-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid and 5-chloro-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid (60 mg, 1 Eq, 0.264 mmol), N-ethyl-N-isopropylpropan-2-amine (DIPEA) (0.138 mL, 3 Eq, 0.793 mmol) and HATU (111 mg, 1.1 Eq, 0.291 mmol). The reaction mixture was stirred at room temperature for 2 h. Purification by reversed phase HPLC (35 55% 0.1% formic acid in MeCN and 0.1% formic acid in H₂O) afforded 3-chloro-N-((1R,3S)-3-((6-chloro-2-(trifluoromethyl)quinolin-4-yl)amino)cyclohexyl)-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxamide (69 mg, 47% yield).

LCMS-ESI (m/z) calculated: 553.09 found 553.8 [M+H]⁺, RT = 10.114 min (Method 1)

¹H NMR (400 MHz, DMSO-d6) δ 8.60 (d, J = 10.9 Hz, 1H), 8.35 (s, 1H), 8.06 (d, J = 7.9 Hz, 1H), 7.90 (d, J = 9.0 Hz, 1H), 7.74 (dd, J = 9.0, 2.3 Hz, 1H), 7.48 (d, J = 7.9 Hz, 1H), 5.21 (q, J = 9.0 Hz, 1H), 4.01-3.83 (m, 2H), 2.17 (d, J = 12.0 Hz, 1H), 2.00-1.78 (m, 3H), 1.61-1.21 (m, 4H).

PAT

WO 2021/092240 A1

PAT

WO 2025/222040 A1

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References

• Modulators of mas-related g-protein receptor x2 and related products and methodsPublication Number:US-2024124416-A1Priority Date:2022-03-30
• Modulators of mas-related g-protein receptor x2 and related products and methodsPublication Number:US-2024059667-A1Priority Date:2022-03-30
• Modulators of mas-related g-protein receptor x2 and related products and methodsPublication Number:US-2024124414-A1Priority Date:2022-03-30
• Quinoline derivatives as modulators of mas-related g-protein receptor x2 and related productsPublication Number:WO-2023192901-A1Priority Date:2022-03-30
• Modulators of mas-related g-protein receptor x2 and related products and methodsPublication Number:US-2024124415-A1Priority Date:2022-03-30
• Modulators of Mas-related G-protein receptor X2 and related products and methodsPublication Number:US-12129243-B2Priority Date:2022-03-30Grant Date:2024-10-29
• Quinoline derivatives as modulators of mas-related g-protein receptor x2 and related productsPublication Number:WO-2023192901-A9Priority Date:2022-03-30
• Modulators of Mas-related G-protein receptor X2 and related products and methodsPublication Number:US-12129244-B2Priority Date:2022-03-30Grant Date:2024-10-29
• Modulators of mas-related g-protein receptor x2 and related products and methodsPublication Number:US-2025026735-A1Priority Date:2022-03-30
• Quinoline derivatives as modulators of mas-related g-protein receptor x2 and related productsPublication Number:EP-4499632-A1Priority Date:2022-03-30

//////////setomagpran, anax labs, Mas-related G protein-coupled receptor antagonist, anti-inflammatory, MYX4KT647F

#setomagpran, #anax labs, #Mas-related G protein-coupled receptor antagonist, #anti-inflammatory, #MYX4KT647F

Seldegamadlin

 

Seldegamadlin

CAS 2713618-08-5

MFC48H52Cl2FN7O6 MW912.9 g/mol

• (3'R,4'S,5'R)-6''-chloro-4'-(3-chloro-2-fluorophenyl)-N-((1r,4R)-4-(4-(1-(2,6-dioxopiperidin-3-yl)-3-methyl-2-oxo-2,3-dihydro-1H-benzo[d]imidazol-5-yl)piperidine-1-carbonyl)cyclohexyl)-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indoline]-5'-carboxamide
• (3'R,4'S,5'R)-6"-chloro-4'-(3-chloro-2-fluorophenyl)-N-((1r,4R)-4-(4-(1-(2,6-dioxopiperidin-3-yl)-3-methyl-2-oxo-2,3-dihydro-1H-benzo[d]imidazol-5-yl)piperidine-1-carbonyl)cyclohexyl)-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3"-indoline]-5'-carboxamide

(3'R,4'S,5'R)-6''-chloro-4'-(3-chloro-2-fluorophenyl)-N-[trans-4-(4-{1-[(3RS)-2,6-dioxopiperidin-3-yl]-3-methyl-2-oxo-2,3-dihydro-1H-1,3-benzimidazol-5-yl}piperidine-1-carbonyl)cyclohexyl]-2''-oxo-1'',2''-dihydrodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indole]-5'-carboxamide
E3 ubiquitin-protein ligase Mdm2 (Hdm2) degrader, antineoplastic, KT 253, KT-253, VNP2BV6KGL

Seldegamadlin (also known as KT-253) is an advanced experimental oncology drug designed as a first-in-class, highly potent MDM2 PROTAC degrader and p53 stabilizer. It utilizes targeted protein degradation (TPD) technology to selectively eliminate the MDM2 oncoprotein, which restores the normal function of the critical tumor suppressor protein, p53.

How it Works

• Targeted Protein Degradation: It acts as a heterobifunctional PROTAC (proteolysis-targeting chimera). It features one end that binds tightly to MDM2 and another end that recruits the cereblon (CRBN) E3 ubiquitin ligase.
• p53 Stabilization: By tethering them together, it forces the cell's natural disposal machinery to ubiquitinate and rapidly destroy MDM2. Because MDM2 normally suppresses and destroys p53, deleting MDM2 leads to an immediate up-regulation and stabilization of active p53.
• Apoptosis Activation: The sudden resurgence of active p53 fires up downstream targets like p21, forcing wild-type p53 cancer cells to halt their cell cycle (at the G2/M phase) and trigger rapid programmed cell death (apoptosis).

Primary Areas of Research

Seldegamadlin is actively being evaluated and researched for therapeutic efficacy against specific wild-type p53 malignancies:

• Hematologic Tumours: Including Acute Myeloid Leukemia (AML) and Acute Lymphoblastic Leukemia (ALL).
• Solid Tumours: Such as Diffuse Large B-cell Lymphoma (DLBCL) and other forms retaining functional p53 signaling pathways

PAT

WO2023049790

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2023049790&_cid=P11-MTWC17-46822-1

[001997] 3-[5-[1-(4-aminocyclohexanecarbonyl)-4-piperidyl]-3-methyl-2-oxo-benzimidazol-1-

yl]piperidine-2,6-dione (Intermediate WP)

[001998] Step 1 - Tert-butyl N-[4-[4-[1-(2,6-dioxo-3-piperidyl)-3-methyl-2-oxo-benzimidazol-5-yl]piperidine-1-carbonyl]cyclohexyl]carbamate. A mixture of 3-[3-methyl-2-oxo-5-(4-piperidyl)benzimidazol-1-yl]piperidine-2,6-dione (200 mg, 584 umol, Intermediate HE), (1s,4s)-4-((tert-butoxycarbonyl)amino)cyclohexane-1-carboxylic acid (142 mg, 584 umol, CAS# 53292-90-3), 1-methylimidazole (1.53 g, 18.6 mmol) , and TCFH (409 mg, 1.46 mmol) in ACN (1 mL) was stirred at 25 °C for 1 min. On completion, the reaction mixture was concentrated to give a residue. The crude product was purified by reversed-phase HPLC (0.1% FA condition) to give the title compound (120 mg, 36% yield) as a white solid.1H NMR (400 MHz, DMSO-d6) δ 11.08 (s, 1H), 7.11 (s, 1H), 7.02 (d, J = 8.0 Hz, 1H), 6.92 (d, J = 8.0 Hz, 1H), 5.34 (dd, J = 5.6, 12.8 Hz, 1H), 4.62 - 4.54 (m, 1H), 4.10 - 3.98 (m, 1H), 3.49 ( s, 1H), 3.33 - 3.31 (m, 4H), 3.18 - 3.05 (m, 1H), 2.96 - 2.85 (m, 1H), 2.83 - 2.74 (m, 1H), 2.71 -2.62 (m, 3H), 2.05 - 1.94 (m, 1H), 1.86 - 1.67 (m, 6H), 1.61 - 1.40 (m, 7H), 1.39 (s, 9H).

[001999] Step 2 - 3-[5-[1-(4-aminocyclohexanecarbonyl)-4-piperidyl]-3-methyl-2-oxo-benzimidazol -1-yl]piperidine-2,6-dione. To a solution of tert-butyl N-[4-[4-[1-(2,6-dioxo-3-piperidyl)-3-methyl-2-oxo-benzimidazol-5-yl] piperidine-1-carbonyl]cyclohexyl]carbamate (60.0 mg, 105 umol) in DCM (1 mL) was added TFA (1.54 g, 13.5 mmol). The mixture was then stirred at 25 °C for 2 mins. On completion, the mixture was concentrated in vacuo to give the title compound (50.0 mg, 80% yield, TFA) as brown oil. LC-MS (ESI+) m/z 468.1 (M+H)⁺.

[00812] (3'R,4'S,5'R)-6''-chloro-4'-(3-chloro-2-fluorophenyl)-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indoline]-5'-carboxylic acid (Intermediate CI)

[00813] Step 1 - (3E)-6-chloro-3-[(3-chloro-2-fluoro-phenyl)methylene]indolin-2-one. A 500 mL 3-necked round bottom flask was charged with 6-chloroindolin-2-one (89.6 g, 535 mmol, CAS# 56341-37-8), 3-chloro-2-fluoro-benzaldehyde (84.8 g, 535 mmol, CAS# 85070-48-0), MeOH (1700 mL) and piperidine (9.11 g, 107 mmol). The mixture was stirred at 65 °C for 5 h, then at 25 °C for 12 h. On completion, the reaction mixture was filtered and the filter cake was dried under reduced pressure to give title product (160 g, 94% yield).¹H NMR (400 MHz, DMSO-d6) δ = 10.87 (s, 1H), 7.82 - 7.63 (m, 2H), 7.56 (s, 1H), 7.39 (t, J = 8.0 Hz, 1H), 7.18 (d, J = 8.0 Hz, 1H), 7.03 - 6.77 (m, 2H).

[00814] Step 2 - (E)-6-chloro-3-(3-chloro-2-fluorobenzylidene)indolin-2-one. (3E)-6-chloro-3-[(3-chloro-2-fluoro-phenyl)methylene]indolin-2-one (50 g, 162 mmol), (5R,6S)-5,6-diphenylmorpholin-2-one (49.3 g, 194 mmol, CAS# 282735-66-4), and cyclohexanone (31.8 g, 324 mmol, 33.6 mL) were dissolved in THF (75 mL) and toluene (750 mL) and 140 ºC for 12 hours. On completion, the reaction mixture was concentrated in vacuo to give a residue. The residue was purified by column chromatography (SiO2, petroleum ether/ethyl acetate=8/1 to 5/1) to give the title compound (160 g 97% purity).¹H NMR (400 MHz, DMSO-d₆) δ = 10.79 (s, 1H), 7.95 ( t, J = 6.8 Hz, 1H), 7.45 - 7.37 (m, 1H), 7.33 - 7.20 (m, 4H), 7.18 - 7.09 (m, 4H), 7.07 - 6.98 (m, 2H), 6.86 - 6.75 (m, 3H), 6.66 (dd, J = 2.0, 8.4 Hz, 1H), 6.35 (d, J = 8.4 Hz, 1H), 5.44 (d, J = 11.2 Hz, 1H), 4.90 (d, J = 2.8 Hz, 1H), 4.58 (d, J = 11.2 Hz, 1H), 2.39 (d, J = 12.8 Hz, 1H), 2.24 - 2.09 (m, 1H), 1.42 - 1.18 (m, 4H), 1.10 - 0.78 (m, 1H).

[00815] Step 3 - (3'S,4'R,7'R,8'S,8a'R)-6''-chloro-8'-(3-chloro-2-fluorophenyl)-3',4'-diphenyl-3',4',8',8a'-tetrahydro-1'H-dispiro[cyclohexane-1,6'-pyrrolo[2,1-c][1,4]oxazine-7',3''-indoline]-1',2''-dione. H₂SO₄ (9.07 g, 92.5 mmol, 4.93 mL) was added to a solution of intermediate (E)-6-chloro-3-(3-chloro-2-fluorobenzylidene)indolin-2-one (9.0 g, 14.03 mmol) dissolved in MeOH (70 mL) and the resulting solution was heated to 50 °C for 5 hours. On completion, the reaction mixture was cooled to 0 °C and slowly neutralized with a solution of saturated sodium bicarbonate. The aqueous solution was extracted with ethyl acetate, and the organic layer was dried over sodium sulfate, filtered, concentrated to give the residue. The residue was purified by reverse phase flash [ACN/(0.1% FA in water), 0% to 90% ] to give title compound (7.0 g 84.2% purity).¹H NMR (400 MHz, DMSO-d6) δ = 7.74 - 7.68 (m, 1H), 7.57 (s, 1H), 7.51 (d, J = 8.4 Hz, 1H), 7.41 (d, J = 7.2 Hz, 4H), 7.25 (d, J = 7.6 Hz, 6H), 7.19 - 7.11 (m, 6H), 7.10 - 6.98 (m, 4H), 6.94 - 6.88 (m, 1H), 6.65 - 6.58 (m, 1H), 5.39 - 5.27 (m, 1H), 4.89 - 4.75 (m, 1H), 4.42 -4.29 (m, 2H), 4.04 (q, J = 6.8 Hz, 1H), 3.63 - 3.53 (m, 2H), 3.40 (s, 3H), 2.22 - 2.12 (m, 1H), 2.05 - 1.94 (m, 3H), 1.40 - 1.32 (m, 2H), 1.28 - 1.13 (m, 3H).

[00816] Step 4 - Methyl (3'R,4'S,5'R)-6''-chloro-4'-(3-chloro-2-fluorophenyl)-1'-((1R,2S)-2-hydroxy-1,2-diphenylethyl)-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indoline]-5'-carboxylate. The resulting intermediate (3'S,4'R,7'R,8'S,8a'R)-6''-chloro-8'-(3-chloro-2-fluorophenyl)-3',4'-diphenyl-3',4',8',8a'-tetrahydro-1'H-dispiro[cyclohexane-1,6'-pyrrolo[2,1-c][1,4]oxazine-7',3''-indoline]-1',2''-dione (7.0 g, 10.3 mmol) was dissolved in ACN (78 mL), then CAN (11.3 g, 20.7 mmol) was added, followed by the addition of H2O (78 mL). The reaction was stirred at 25 °C for 30 min. On completion, the reaction mixture was quenched by adding the mixture to a cold saturated aqueous NaHCO3 solution (50 mL). The aqueous layer was extracted with ethyl acetate (20 mL x 3). The organic layer was separated, dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to give the residue. The residue was purified by column chromatography (SiO2, petroleum ether/ethyl acetate=50/1 to 5/1) to give title compound (1.58 g, 31% purity). LC-MS (ESI⁺) m/z 477.2 (M+H)⁺.

[00817] Step 5 - (3'R,4'S,5'R)-6''-chloro-4'-(3-chloro-2-fluorophenyl)-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indoline]-5'-carboxylic acid. Methyl (3'R,4'S,5'R)-6''-chloro-4'-(3-chloro-2-fluorophenyl)-1'-((1R,2S)-2-hydroxy-1,2-diphenylethyl)-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indoline]-5'-carboxylate (2.00 g, 4.19 mmol) was dissolved in THF (14 mL) and LiOH^.H₂O (527 mg, 12.5 mmol) was added followed by water (14 mL) and MeOH (2 mL) and the reaction was stirred at 25 °C for 15 min. On completion, water (20 mL) was added and the reaction was slowly neutralized with 2M HCl and the suspension was stirred for 15 min. The resulting precipitate was filtered, washed with water to give title compound (1.50 g, 70% yield).¹H NMR (400 MHz, DMSO-d₆) δ = 10.75 - 10.57 (m, 1H), 10.55 (s, 1H), 7.61 - 7.54 (m, 1H), 7.50 - 7.44 (m, 1H), 7.41 - 7.34 (m, 1H), 7.18 - 7.12 (m, 1H),

7.08 - 7.02 (m, 1H), 6.72 - 6.66 (m, 1H), 4.72 - 4.65 (m, 1H), 4.54 - 4.47 (m, 1H), 3.18 - 3.15 (m, 1H), 2.22 - 2.13 (m, 1H), 1.83 - 1.70 (m, 2H), 1.64 - 1.52 (m, 3H), 1.51 - 1.43 (m, 2H), 1.42 - 1.34 (m, 1H), 1.04 - 0.92 (m, 1H), 0.89 - 0.77 (m, 1H). LC-MS (ESI⁺) m/z 463.2 (M+H)⁺.

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References

• Mdm2 degraders and uses thereofPublication Number:WO-2023049790-A2Priority Date:2021-09-22
• Mdm2 degraders and uses thereofPublication Number:US-2024025878-A1Priority Date:2020-03-19
• Mdm2 degraders and uses thereofPublication Number:WO-2021188948-A1Priority Date:2020-03-19
• Methods of treating cancerPublication Number:WO-2023114933-A1Priority Date:2021-12-15
• Methods of treating cancerPublication Number:US-2023233546-A1Priority Date:2021-12-15
• Methods of treating cancerPublication Number:CN-118574613-APriority Date:2021-12-15
• Methods of treating cancerPublication Number:EP-4447959-A1Priority Date:2021-12-15
• Mdm2 degraders and uses thereofPublication Number:EP-4405359-A2Priority Date:2021-09-22
• Mdm2 degraders and uses thereofPublication Number:WO-2025096262-A1Priority Date:2023-11-01
• Mdm2 degraders and uses thereofPublication Number:WO-2024197219-A1Priority Date:2023-03-22
• Mdm2 degraders and uses thereofPublication Number:WO-2024197216-A2Priority Date:2023-03-22
• Mdm2 degraders and uses thereofPublication Number:US-2025352535-A1Priority Date:2022-06-06
• Mdm2 degraders and uses thereofPublication Number:WO-2023239697-A1Priority Date:2022-06-06

///////////////////seldegamadlin, anax labs, E3 ubiquitin-protein ligase Mdm2 (Hdm2) degrader, antineoplastic, KT 253, KT-253, VNP2BV6KGL

#seldegamadlin, #anax labs, #E3 ubiquitin-protein ligase Mdm2 (Hdm2) degrader, #antineoplastic, #KT 253, #KT-253, #VNP2BV6KGL