An expedient synthesis of α,α-difluoro-β-hydroxy ketones via decarboxylative aldol reaction of α,α-difluoro-β-keto acids with aldehydes
作者:Da-Kang Huang、Zhong-Liang Lei、Yu-Jun Zhu、Zhen-Jiang Liu、Xiao-Jun Hu、Hai-Fang Mao
DOI:10.1016/j.tetlet.2017.07.060
日期:2017.8
A novel decarboxylative aldol reaction of α,α-difluoro-β-keto acids with aldehydes in the absence of any base and metal catalysts has been developed. This reaction provides a highly convenient and efficient method for the synthesis of structurally diverse α,α-difluoro-β-hydroxy ketones in good to excellent yields.
We developed a decarboxylativealdolreaction using α,α-difluoro-β-ketocarboxylate salt, carbonyl compounds, and ZnCl2/N,N,N′,N′-tetramethylethylenediamine. The generation of difluoroenolate proceeded smoothly under mild heating to provide α,α-difluoro-β-hydroxy ketones in good to excellent yield (up to 99%). The α,α-difluoro-β-ketocarboxylate salt was bench stable and easy to handle under air, which
我们使用 α,α-二氟-β-酮羧酸盐、羰基化合物和 ZnCl 2 / N , N , N ', N '-四甲基乙二胺开发了脱羧醛醇反应。二氟烯醇化物的生成在温和加热下顺利进行,以良好至优异的产率(高达 99%)提供 α,α-二氟-β-羟基酮。α,α-二氟-β-酮基羧酸盐具有台架稳定性,在空气中易于操作,实现了一种方便、环保的二氟亚甲基化合物合成方法。
2,2-Difluoro enol silyl ethers were readily prepared by Mg0 promoted selective defluorination of trifluoromethyl ketones in the presence of TMSCl, which involves CâF bond cleavage.
Copper-catalysed difluoroalkylation of aromatic aldehydes via a decarboxylation/aldol reaction
作者:Jin-Wei Yuan、Shuai-Nan Liu、Wen-Peng Mai
DOI:10.1039/c7ob01739a
日期:——
A copper-catalysed tandem decarboxylation/aldol reaction of simple aromaticaldehydes with 2,2-difluoro-3-oxo-3-arylpropanoic acid has been developed under mild conditions. This method provides a new route for the direct one-pot synthesis of difluorinated aldols in moderate to good yields from simple substrates.