Soquelitinib

CAS 2226636-04-8

MF C25H30N4O4S2, 514.7 g/mol

N-[5-({4-methoxy-2-methyl-5-[(3R)-3-methyl-4-(prop-2-enoyl)-1,4-diazepane-1-carbonyl]phenyl}sulfanyl)-1,3-thiazol-2-yl]cyclopropane-1-carboxamide
tyrosine kinase inhibitor, antineoplastic, CPI818, CPI-000818, CPI596, CP I818, CPI 000818, CP I596, 6I5H17AN3I,

N-[5-[4-methoxy-2-methyl-5-[(3R)-3-methyl-4-prop-2-enoyl-1,4-diazepane-1-carbonyl]phenyl]sulfanyl-1,3-thiazol-2-yl]cyclopropanecarboxamide

Soquelitinib (CPI-818) is an experimental drug which acts as a selective inhibitor of the enzyme interleukin-2-inducible T-cell kinase (ITK). It is in clinical trials for the treatment of T-cell lymphoma.^[1][2]

Soquelitinib is an orally available, small-molecule, irreversible inhibitor of interleukin-2 inducible T-cell kinase (ITK) with potential immunomodulatory and antineoplastic activities. Upon oral administration, soquelitinib selectively and covalently binds to the cysteine residue at position 442 (CYS-442) of ITK, thereby disrupting ITK-mediated signal transduction, while sparing tyrosine-protein kinase TXK (resting lymphocyte kinase, RLK) activity. This may abrogate T-cell receptor (TCR) signaling through ITK and inhibit TCR-induced proliferation of malignant T-cells. Additionally, inhibiting ITK activation may prevent the upregulation of GATA-3, a transcription factor that drives T-helper 2 (Th2) cell differentiation and is overexpressed in certain T-cell lymphomas. Thus, selective inhibition of ITK may inhibit Th2 responses without affecting T-helper 1 (Th1)-dependent immunity. ITK, a member of the Tec family of non-receptor protein tyrosine kinases plays a significant role in the T-cell development, differentiation and production of pro-inflammatory cytokines.

• Safety, Tolerability, and Preliminary Efficacy of Soquelitinib in Participants With Moderate to Severe ADCTID: NCT06345404Phase: Phase 1Status: RecruitingDate: 2025-07-22
• Study of the ITK Inhibitor Soquelitinib to Reduce Lymphoproliferation and Improve Cytopenias in Autoimmune Lymphoproliferative Syndrome (ALPS)-FAS PatientsCTID: NCT06730126Phase: Phase 2Status: RecruitingDate: 2025-05-31
• Soquelitinib vs Standard of Care in Participants With Relapsed/Refractory Peripheral T-cell Lymphoma Not Otherwise Specified, Follicular Helper T-cell Lymphomas, or Systemic Anaplastic Large-cell LymphomaCTID: NCT06561048Phase: Phase 3Status: RecruitingDate: 2025-04-17
• A Dose Escalation Study Evaluating CPI-818 in Relapsed/Refractory T-Cell LymphomaCTID: NCT03952078Phase: Phase 1Status: Active, not recruitingDate: 2025-04-16

Syn

• US11008314,
• https://patentscope.wipo.int/search/en/detail.jsf?docId=US278926237&_cid=P10-MISM56-82578
• SIMILAR

Syn

• WO2018089261 COMPD 44
• https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018089261&_cid=P10-MISM0C-78029-1

SYN

WO-2023196278-A1

Embodiment B23. A method for an Th2/ITK-mediated disease in a patient in need thereof, the method comprising administering to the patient about 250 mg to about 1,000 mg per day of a compound of Formula (A) or a pharmaceutically acceptable salt thereof, wherein the compound of Formula (A) is:

REF

https://www.nature.com/articles/s44386-024-00002-1

Pat

• Compounds and methods for modulating interleukin-2-inducible t-cell kinasePublication Number: US-2022363676-A1Priority Date: 2016-11-03
• Compounds and methods for modulating Interleukin-2-inducible T-cell kinasePublication Number: US-11897874-B2Priority Date: 2016-11-03Grant Date: 2024-02-13
• Itk inhibitors for increasing th1 cell activityPublication Number: WO-2023196278-A1Priority Date: 2022-04-05
• Compounds and methods for modulating interleukin-2-inducible t-cell kinasePublication Number: US-2019375743-A1Priority Date: 2016-11-03
• Compounds and methods for modulating interleukin-2-inducible t-cell kinasePublication Number: WO-2018089261-A2Priority Date: 2016-11-03
• Compounds and methods for modulating interleukin-2-inducible t-cell kinasePublication Number: US-11008314-B2Priority Date: 2016-11-03Grant Date: 2021-05-18
• Compounds and methods for modulating interleukin-2-inducible t-cell kinasePublication Number: EP-3534899-B1Priority Date: 2016-11-03Grant Date: 2022-06-01

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References

1.  Khodadoust MS, Feldman TA, Yoon DH, Yannakou CK, Radeski D, Kim YH, et al. (November 2020). “Cpi-818, an oral interleukin-2-inducible T-cell kinase inhibitor, is well-tolerated and active in patients with T-cell lymphoma”. Blood. 136: 19–20. doi:10.1182/blood-2020-137782.
2.  Hsu LY, Rosenbaum JT, Verner E, Jones WB, Hill CM, Janc JW, et al. (December 2024). “Synthesis and characterization of soquelitinib a selective ITK inhibitor that modulates tumor immunity”. npj Drug Discovery. 1 (1) 2: 1–4. doi:10.1038/s44386-024-00002-1.

Identifiers
IUPAC name
CAS Number	2226636-04-8
PubChem CID	134517711
DrugBank	DB18749
ChemSpider	129629996
UNII	6I5H17AN3I
KEGG	D12762
Chemical and physical data
Formula	C25H30N4O4S2
Molar mass	514.66 g·mol−1
3D model (JSmol)	Interactive image
SMILES
InChI

//////////////Soquelitinib, tyrosine kinase inhibitor, antineoplastic, CPI818, CPI-000818, CPI596, CP I818, CPI 000818, CP I596, 6I5H17AN3I,