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。
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.
remarkable fluorine effect on “on water” reactions is reported. The CF⋅⋅⋅HO interactions between suitably fluorinated nucleophiles and the hydrogen‐bond network at the phase boundary of oil droplets enable the formation of a unique microstructure to facilitate on water catalyst‐free reactions, which are difficult to realize using nonfluorinated substrates. Accordingly, a highlyefficient on water, catalyst‐free
The α,α-difluoro-β-hydroxyketone skeleton is an important pharmacodynamic structure in the synthesis study of pharmaceuticals. Herein, we describe a novel iron mediated Reformatsky reaction of iododifluoroacetophenones with aldehydes, which offers a relatively more economical and environment friendly route for the construction of α,α-difluoro-β‑hydroxyl ketone with good yield. In addition, iron shows
Reaction of aldimines and difluoroenoxysilane, an unexpected protocol for the synthesis of 2,2-difluoro-3-hydroxy-1-ones
作者:Zhi-Liang Yuan、Yin Wei、Min Shi
DOI:10.1016/j.tet.2010.07.034
日期:2010.9
An unexpected reaction of aldimines and difluoroenoxysilane promoted with Zn(OTf)(2) was disclosed. The reaction gave the unexpected Mukaiyama-aldol adducts 3 in excellent yields (up to 87%) with the addition of H2O and the corresponding Mannich-type adduct 4 was not observed in this catalytic system. (C) 2010 Elsevier Ltd. All rights reserved.