Mn(III)-based reactions of alkenes and alkynes with thiols. An approach toward substituted 2,3-dihydro-1,4-oxathiins and simple route to (E)-vinyl sulfides
作者:Van-Ha Nguyen、Hiroshi Nishino、Shougo Kajikawa、Kazu Kurosawa
DOI:10.1016/s0040-4020(98)00707-8
日期:1998.9
reaction with thioglycolic acid gave 1,4-oxathiolan-2-one 7. While thiyl radicals easily formed by manganese(III) oxidation with ethanethiol or benzenethiol reacted with alkynes to give preferentially (E)-vinyl sulfides 10 in quantitative yields.
考察了在1,1-二芳烃与α-巯基酮反应中使用乙酸锰(III)的第一个实例。用乙酸锰(III)在乙酸中处理乙烯和α-巯基酮的混合物,得到中等收率的环加成产物以及取代的产物。该反应可能涉及碳正离子的形成和随后的环化,以得到取代的2,3-二氢-1,4-氧杂环丁烷3。与巯基乙酸的类似反应得到1,4-氧杂硫杂环戊烷-2-酮7。尽管通过锰(III)与乙硫醇或苯硫醇的氧化而容易形成的噻吩基与炔烃反应,以定量收率优先得到(E)-乙烯基硫化物10。