A Novel Synthetic Approach to 2,2,2-Trifluoroethylidene Derivatives from Ketones.
作者:Satoru KANEKO、Noriyuki NAKAJIMA、Tadashi KATOH、Shiro TERASHIMA
DOI:10.1248/cpb.45.43
日期:——
An approach to 2, 2, 2-trifluoroethylidene derivatives from ketones was explored by employing the Corey-Winter's reductive elimination of 4-trifluoromethyl-1, 3-dioxolane-2-thiones to 2, 2, 2-trifluoroethylidene derivatives as a key step. The 1, 3-dioxolane-2-thione derivatives were readily prepared from ketones in five steps by sequential formation of O-silylated cyanohydrins, reduction, addition of trifluoromethyltrimethylsilane, desilylation, and formation of the 1, 3-dioxolane-2-thione system.
作为一个关键步骤,采用科里-温特(Corey-Winter)还原消除 4-三氟甲基-1,3-二氧戊环-2-硫酮的方法,探索了从酮类制备 2,2,2-三氟亚乙基衍生物的方法。1, 3-二氧戊环-2-硫酮衍生物很容易从酮类化合物中通过五个步骤制备出来:依次形成 O-硅烷化氰基水合物、还原、加入三氟甲基三甲基硅烷、脱硅和形成 1, 3-二氧戊环-2-硫酮体系。