α,α-Diacetyl Cyclic Ketene Dithioacetals: Odorless and Efficient Dithiol Equivalents in Thioacetalization Reactions
作者:Qun Liu、Dewen Dong、Haifeng Yu、Yanbing Yin、Qunxin Fang、Jingping Zhang
DOI:10.1055/s-2004-822892
日期:——
Two novel, non-thiolic, odorless dithiol equivalents, α,α-diacetyl cyclic ketene dithioacetals 2a and 2b, had been developed. A range of carbonyl compounds 3 were converted into corresponding dithioacetals, dithianes 4 and dithiolanes 5, in high yields (up to 99%) in the presence of 2a or 2b. Moreover, 2a and 2b show high chemoselectivity between aldehyde and ketone in thioacetalization.
开发了两种新型非硫醇类、无臭的二硫醇等效物,即α,α-二乙酰环状酮烯二硫缩酮2a和2b。一系列羰基化合物3在与2a或2b的存在下,高产率(高达99%)地转化为相应的二硫缩酮4和二硫醇环5。此外,2a和2b在硫缩酮化过程中对醛和酮显示出高度的化学选择性。