Vinylogous nucleophilic catalysis. Tertiary amine promoted hydrolysis of 1-alkene-1-sulfonyl chlorides
作者:James Frederick King、John Henry Hillhouse、Stanisław Skonieczny
DOI:10.1139/v84-339
日期:1984.10.1
We present evidence that the reactions of ethenesulfonyl chloride (1) and trans-1-propene-1-sulfonyl chloride (3) with water in the presence of pyridine, trimethylamine, and a number of other tertiary amines proceed primarily by way of an initial vinylogous substitution reaction to form the cationic sulfene, , which subsequently reacts with water either by addition (and deprotonation) to form the betaine
我们提供的证据表明,在吡啶、三甲胺和许多其他叔胺存在下,乙烯磺酰氯 (1) 和反式-1-丙烯-1-磺酰氯 (3) 与水的反应主要通过初始乙烯基取代反应形成阳离子亚砜,随后通过加成(和去质子化)与水反应形成甜菜碱,或通过乙烯基取代(和去质子化)得到烯烃磺酸根阴离子(R = H 或 CH3)。后者的形成代表了乙烯基亲核催化的第一个得到充分支持的例子。这些结论是从动力学和产品组成观察中得出的,包括 (a) 甜菜碱中的 α-单氘化和 D2O 中反应的乙烯磺酸缺乏氘化,