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。