Tertiary Alcohols by Tandem β-Carbolithiation and N→C Aryl Migration in Enol Carbamates
作者:Anne M. Fournier、Jonathan Clayden
DOI:10.1021/ol2029355
日期:2012.1.6
Enol carbamates (O-vinylcarbamates) derived from aromatic or α,β-unsaturated compounds and bearing an N-aryl substituent undergo carbolithiation by nucleophilic attack at the (nominally nucleophilic) β position of the enol double bond. The resulting carbamate-stabilized allylic, propargylic, or benzylic organolithium rearranges with N→C migration of the N-aryl substituent, creating a quaternary carbon
衍生自芳族或α,β-不饱和化合物并带有N-芳基取代基的烯醇氨基甲酸酯(O-乙烯基氨基甲酸酯)在烯醇双键的(名义亲核)β位置通过亲核攻击进行碳锂化。生成的氨基甲酸酯稳定的烯丙基,炔丙基或苄基有机锂通过N-C芳基取代基的N→C迁移而重排,从而形成季碳α到O。产物可以很容易地水解以在一个锅中生成多支链的叔醇串联反应,实际上是烯醇等效物的极性反转的亲核β-烷基化-亲电α-芳基化反应。