Influence of functional substitution of allyl halides on their ni(co)4 promoted carbonylative cycloaddition with acetylenes
作者:Francisco Camps、Josep M. Moreto、Lluis Pages
DOI:10.1016/s0040-4020(01)92256-2
日期:1992.4
were shown to favour competing side reactions such as allyl self-coupling. However, only cyclopentenones were obtained from either centrally or terminally substituted silylallyl halides. Substitution at both ends of the allyl moiety led to the formation of 4,5-disubstituted cyclopentenones. Important mechanistic information could be achieved from determination of the relative stereochemistry in these
已经研究了烯丙基卤化物的功能取代对标题反应结果的影响。吸电子和烯烃基团根据其位置而具有不同的作用。当将它们置于烯丙基部分的中心位置时,发现羰基化环加成是丙酮中的主要反应,仅产生环己烯酮(或芳香族)衍生物。相反,在末端位点和与烯丙基官能团的过度结合中的相同基团显示出有利于竞争性副反应,例如烯丙基自偶联。然而,仅环戊烯酮是从中心或末端取代的甲硅烷基烯丙基卤化物获得的。烯丙基部分的两端取代导致4,5-二取代的环戊烯酮的形成。