Nucleophilic Difluoromethylation of Epoxides with PhSO(NTBS)CF<sub>2</sub>H by a Preorganization Strategy
作者:Xiao Shen、Qinghe Liu、Tao Luo、Jinbo Hu
DOI:10.1002/chem.201402506
日期:2014.5.26
synthesis of β‐monofluoromethyl alcohols by nucleophilic monofluoromethylation of epoxides, the synthesis of β‐difluoromethyl alcohols by nucleophilic difluoromethylation of epoxides still remains a challenge. Herein, studies on tackling this problem with PhSO(NTBS)CF2H (2; TBS=tert‐butyldimethylsilyl) are reported. The preorganization of 2 and epoxides with BF3⋅Et2O was found to be crucial for the
与通过环氧化物的亲核单氟甲基化轻松合成β-单氟甲基醇不同,通过环氧化物的亲核二氟甲基化合成β-二氟甲基醇仍然是一个挑战。在此,已报道了用PhSO(NTBS)CF 2 H(2; TBS =叔丁基二甲基甲硅烷基)解决此问题的研究。的preorganization 2个环氧化物与BF 3 ⋅的Et 2发现O对于反应至关重要。该反应显示出优异的区域选择性并且具有广泛的底物范围。开环产物容易转化为β-二氟甲基,γ-二氟甲基和β-二氟亚甲基醇,证明了该反应的合成效用。