Silyllithium-Initiated Coupling of α-Ketoamides with <i>tert</i>-Butanesulfinylimines for Stereoselective Synthesis of Enantioenriched α-(Silyloxy)-β-amino Amides
作者:Zhao Sun、Hui Liu、Yong-Ming Zeng、Chong-Dao Lu、Yan-Jun Xu
DOI:10.1021/acs.orglett.6b00006
日期:2016.2.5
A silyllithium-initiated coupling of α-ketoamides with tert-butanesulfinylimines was developed for the efficient, stereoselective synthesis of enantioenriched α-(silyloxy)-β-amino amides. Nucleophilic addition of silyllithium to α-ketoamides, followed by 1,2-Brook rearrangement, generates nucleophilic enolates, which are then intercepted by chiral imines to provide three-component coupling products
开发了甲硅烷基锂引发的α-酮酰胺与叔丁烷亚磺酰亚胺的偶联,以有效,立体选择性地合成对映体富集的α-(甲硅烷氧基)-β-氨基酰胺。甲硅烷基锂向α-酮酰胺的亲核加成,然后进行1,2-Brook重排,生成亲核烯醇化物,然后被手性亚胺截获以提供三组分偶联产物。使用α-酮酰胺对于在所得α-羟基-β-氨基酸衍生物中获得高产率和非对映选择性至关重要。