The stereoselective synthesis of α,α-difluoro-β-hydroxyketones of high enantiomeric purity is described starting from opticallyactiveα,α-difluoro-β-hydroxy esters. The esters were converted to the corresponding N-methoxy-N-methyl amides, which were treated with Grignard and organolithium reagents to provide the α,α-difluoro-β-hydroxyketones with up to 100% ee.
2-Benzylidene-4,4-difluorodihydrofuran-3(2H)-ones were synthesised in 58―86% yield via phosphine-promoted cyclisation of β-hydroxy-α,α-difluoroynones. The benzylidene group was found to be a suitable masked carbonyl group, thereby allowing for the validation of a novelroute to 3,3-difluoro-2-hydroxy-γ-lactols.
Synthesis of 2-(2-Aminopyrimidine)-2,2-difluoroethanols as Potential Bioisosters of Salicylidene Acylhydrazides
作者:Markus K. Dahlgren、Christopher T. Öberg、Erika A. Wallin、Pär G. Janson、Mikael Elofsson
DOI:10.3390/molecules15064423
日期:——
Salicylidene acylhydrazides are inhibitors of type III secretion in several Gram-negative pathogens. To further develop the salicylidene acylhydrazides, scaffold hopping was applied to replace the core fragment of the compounds. The novel 2-(2-amino-pyrimidine)-2,2-difluoroethanol scaffold was identified as a possible analog to the salicylidene acylhydrazide core structure. The synthesis of a library of 2-(2-amino-pyrimidine)-2,2-difluoro-ethanols is described in this paper.
水杨烯酰肼是几种革兰氏阴性病原体的 III 型分泌抑制剂。为了进一步开发水杨烯酰肼,研究人员采用了支架跳转的方法来替换化合物的核心片段。新型 2-(2-氨基嘧啶)-2,2-二氟乙醇支架被确定为水杨酰酰肼核心结构的可能类似物。本文介绍了 2-(2-氨基嘧啶)-2,2-二氟乙醇库的合成。