Phosphine-Catalyzed Doubly Stereoconvergent γ-Additions of Racemic Heterocycles to Racemic Allenoates: The Catalytic Enantioselective Synthesis of Protected α,α-Disubstituted α-Amino Acid Derivatives
作者:Marcin Kalek、Gregory C. Fu
DOI:10.1021/jacs.5b05528
日期:2015.7.29
specifically, that a chiral phosphepine can catalyze the stereoconvergent γ-addition of a racemic nucleophile to a racemic electrophile; through the choice of an appropriate heterocycle as the nucleophilic partner, this new method enables the synthesis of protected α,α-disubstituted α-amino acid derivatives in good yield, diastereoselectivity, and enantioselectivity.
最近开发了将亲核试剂不对称 γ-加成到容易获得的烯丙酸酯和炔酸酯的方法,以生成有用的 α,β-不饱和羰基化合物,这些化合物在 γ 或 δ 位置(但不是两者)带有立体中心具有高立体选择性。如果可以有效控制新键两端的立体化学,则该方法的实用性将大大增强。在本报告中,我们描述了这一目标的实现,具体而言,手性膦可以催化外消旋亲核试剂与外消旋亲电试剂的立体会聚γ-加成;通过选择合适的杂环作为亲核伙伴,这种新方法能够以良好的收率合成受保护的 α,α-二取代 α-氨基酸衍生物,