.delta.,.epsilon.-Unsaturated .beta.,.beta.-Difluoro-.alpha.-keto Esters: Novel Synthesis and Utility as Precursors of .beta.,.beta.-Difluoro-.alpha.-amino Acids
作者:Guo-qiang Shi、Wei-ling Cai
DOI:10.1021/jo00125a013
日期:1995.10
Treatment of the hemiketals 6 formed from ethyl trifluoropyruvate and primary allylic alcohols with SOCl2 and pyridine readily afforded a number of alpha-chloro-beta,beta,beta-trifluorolactyl allyl ethers 2. Subsequent reductive dechlorofluorination from 2 led to the formation of allyl-substituted difluoroenol pyruvyl ethers 3 whose Claisen rearrangement provided a convenient access to a variety of delta,epsilon-unsaturated beta,beta-difluoro-alpha-keto esters 4. As further transformation, direct conversion of beta,beta-difluoro-alpha-keto esters to the corresponding beta,beta-difluoro-alpha-amino acids was achieved by reductive amination of the corresponding alpha-keto acids with NH3 . H2O/NaBH4. Furthermore, use of the prepared beta beta-difluoro-alpha-keto ester 4a as a common precursor of other structurally related beta,beta-difluoro-alpha-amino acids was demonstrated by the synthesis of beta,beta-difluoroproline (18) and beta,beta-difluoroglutamic acid (23) through synthetic elaboration of its inherent double bond.
[EN] CASEIN KINASE 1 DELTA MODULATORS<br/>[FR] MODULATEURS DE LA CASÉINE KINASE 1 DELTA
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2022058920A1
公开(公告)日:2022-03-24
A compound of Formula (I), pharmaceutical compositions containing them, methods of making them, and methods of using them including methods for treating disease states, disorders, and conditions associated with casein kinase 1 delta (CSNK1D) modulation, such as those associated with mood/psychiatric disorders, neurodegenerative diseases, cancers, addiction and substance abuse disorders, pain, and metabolic diseases.Wherein R1, R2, R3, and R4, are defined herein.