The Hydroboration of 1-Alkylthio-l-alkynes, and Its Application to the Syntheses of<i>S</i>-Alkyl Alkanethioates and (<i>Z</i>)-1-Alkylthio-1-alkenes
作者:Masayuki Hoshi、Yuzuru Masuda、Akira Arase
DOI:10.1246/bcsj.63.447
日期:1990.2
Hydroboration of 1-alkylthio-1-alkynes with dicyclohexylborane or bis(1,2-dimethylpropyl)borane proceeded smoothly, adding most of the dialkylboryl group to the α-position of the triple bond. The resulting alkenylboranes afforded either S-alkyl alkanethioates on a controlled oxidation with alkaline hydrogen peroxide in the presence of N,N,N′,N′-etramethylethylenediamine or (Z)-1-alkylthio-1-alkenes on a basic protonolysis, successive treatments with methyllithium, copper(I) iodide and water in the presence of hexamethylphosphoric triamide.
1-烷基硫-1-炔与二环己基硼或双(1,2-二甲基丙基)硼的水硼化反应顺利进行,将大部分二烷基硼基团添加到三键的α位。所得到的烯基硼烃在控制氧化条件下与碱性过氧化氢反应,可生成S-烷基烷硫酸酯,或在碱性质子解离、与甲基锂、铜(I)碘化物和水依次处理的条件下,生成(Z)-1-烷基硫-1-烯。