Tandem β-Alkylation−α-Arylation of Amines by Carbolithiation and Rearrangement of <i>N</i>-Carbamoyl Enamines (Vinyl Ureas)
作者:Jonathan Clayden、Morgan Donnard、Julien Lefranc、Alberto Minassi、Daniel J. Tetlow
DOI:10.1021/ja1007992
日期:2010.5.19
an umpolung fashion to the beta-carbon of N-carbamoyl enamines (N-vinyl ureas). The reaction proceeds with syn diastereospecificity and provides urea-stabilized, configurationally defined organolithiums. Facilitated by coordinating solvents (THF or DMPU), these undergo intramolecular attack on an N'-aryl group, resulting in retentive arylation of the organolithium and hence overall addition of an alkyl
有机锂以 umpolung 方式添加到 N-氨基甲酰基烯胺(N-乙烯基脲)的 β-碳上。该反应以顺式非对映特异性进行,并提供尿素稳定的、构型确定的有机锂。在配位溶剂(THF 或 DMPU)的促进下,它们对 N'-芳基进行分子内攻击,导致有机锂的保留性芳基化,从而将烷基或芳基整体添加到脲取代烯烃的两个碳原子上。在热丁醇中轻松脱保护允许快速、多组分构建重取代胺。