Insertion of cyclopropanes between a carbonyl carbon and an α-carbon of carbonyl compounds with cyclopropylmagnesium carbenoids
作者:Tsuyoshi Satoh、Gaku Kashiwamura、Shinobu Nagamoto、Yuki Sasaki、Shimpei Sugiyama
DOI:10.1016/j.tetlet.2011.06.069
日期:2011.8
The reaction of the lithium enolates of α-aryl carbonyl compounds with cyclopropylmagnesium carbenoids, derived from 1-chlorocyclopropyl p-tolyl sulfoxides with i-PrMgCl at low temperature, resulted in the formation of β-aryl carbonyl compounds bearing a cyclopropane ring at the α-position with one-carbon homologation in variable yields. The reaction was found to be highly stereospecific with respect
α-芳基羰基化合物的烯醇锂与衍生自1-氯环丙基对甲苯基亚砜的环丙基镁类胡萝卜素与i- PrMgCl在低温下反应,导致在α处形成带有环丙烷环的β-芳基羰基化合物位具有可变碳收率的一碳同系物。关于环丙基镁类胡萝卜素的立体化学,发现该反应具有高度立体特异性。还讨论了反应的立体特异性的机理和起源。这是在羰基化合物的羰基碳和α-碳之间插入环丙烷的第一个例子。