Lewis Acid Mediated Reactions of <i>N</i>-Arylsulfonimidoyl Chlorides with Alkenes. Some Steric Effects of Alkene Substitution
作者:Michael Harmata、Mehmet Kahraman
DOI:10.1021/jo980503b
日期:1998.10.1
The Lewis acid-mediated reaction of N-phenyl-S-(4-methylphenyl)sulfonimidoyl chloride with alkenes was explored in order to determine the effect of alkene substitution on the stereochemical outcome of the reaction. With monosubstituted alkenes, benzothiazines are produced with relatively low diastereoselection, with one unique exception, trimethylsilylethene. 1,1-Disubstituted alkenes give products
研究了路易斯酸介导的N-苯基-S-(4-甲基苯基)磺酰亚胺基氯与烯烃的反应,以确定烯烃取代对反应立体化学结果的影响。对于单取代的烯烃,生产的苯并噻嗪具有相对较低的非对映选择性,唯一的例外是三甲基甲硅烷基乙烯。1,1-二取代的烯烃使产物的立体选择性更低。对于三取代的烯烃,位阻效应开始改变反应的过程,从可以合理地作为环加成反应的反应到似乎肯定会产生碳阳离子中间体的反应。有趣的是,在(E)-和(Z)-2-丁烯的反应中观察到的立体选择显示出与标准的较大偏差,其中(E)-2-丁烯以45∶1的比例产生了两种非对映体的苯并噻嗪。