Ketene dithioacetals in organic synthesis: Synthesis of silyl ketene dithioacetal and some reactions with substituted benzaldehydes.
作者:Yoshinori TOMINAGA、Yoshiki MATSUOKA、Chizuko KAMIO、Akira HOSOMI
DOI:10.1248/cpb.37.3168
日期:——
A new silyl ketene dithioacetal, 1, 1-bis(methylthio)-2-trimethylsilylethene, was synthesized by the reaction of the enolate of methyl trimethylsilylmethyldithiocarboxylate, which was prepared by treating trimethylsilylmethylmagnesium chloride with carbon disulfide followed by successive treatment with methyl iodide and then lithium diisopropylamide in ether combined with methyl iodide. The silyl ketene dithioacetal, which can be viewed as a vinylsilane, reacted with substituted benzaldehydes in the presence of a Lewis acid to give the corresponding allylic alcohols.
一种新的硅酮二硫代乙缩醛--1, 1-双(甲硫基)-2-三甲基硅烷基烯,是通过三甲基硅甲基二硫代羧酸甲酯的烯醇盐反应合成的,该烯醇盐是用二硫化碳处理三甲基硅甲基氯化镁,然后用碘甲烷连续处理,再用二异丙基酰胺锂在乙醚中与碘甲烷结合后制备的。硅酮二硫代乙缩醛可视为乙烯基硅烷,在路易斯酸存在下与取代的苯甲醛反应,生成相应的烯丙基醇。