3,5-Bis(trifluoromethyl)pyrazoles: A Novel Class of NFAT Transcription Factor Regulator
摘要:
A series of bis(trifluoromethyl)pyrazoles (BTPs) has been found to be a novel inhibitor of cytokine production. Identified initially as inhibitors of IL-2 synthesis, the BTPs have been optimized in this regard and even inhibit IL-2 production with a 10-fold enhancement over cyclosporine in an ex vivo assay. Additionally, the BTPs show inhibition of IL-4, IL-5, IL-8, and eotaxin production. Unlike the IL-2 inhibitors, cycloseorine and FK506, the BTPs do not directly inhibit the dephosphorylation of NFAT by calcineurin.
Compounds having the formula
1
are useful for treating diseases that are prevented by or ameliorated with Interleukin-2, Interleukin-4, or Interleukin-5 production inhibitors.
A facile diastereoselective synthesis of highly functionalised 3-(1-diphenylphosphonylethyl)butyrolactone analogues, 3a-c is achieved from the reaction of dialkyl acetylenedicarboxylates, 2a,b, with thiolated and trifluoromethylated-1,3-diones, CH acids, 1a,b, in the presence of triphenyl phosphite. The resulting products, 3a-c, are obtained in high yields and characterised by H-1/C-13, F-19, P-31 NMR and X-ray crystallography. (C) 2007 Elsevier Ltd. All rights reserved.
BABU, SRINIVASAN;POZZO, MARK J., J. HETEROCYCL. CHEM., 28,(1991) N, C. 819-321