作者:Nicola Vignola、Benjamin List
DOI:10.1021/ja0392566
日期:2004.1.1
The development of a general catalytic asymmetric aldehyde alpha-alkylation reaction constitutes a major challenge in organic synthesis. Here, we report the first and successful approach toward its solution: (S)-alpha-methyl proline catalyzes the intramolecular alkylation of various halo aldehydes to the corresponding formyl cyclopentanes, -cyclopropanes, or -pyrrolidines in excellent yields and enantioselectivities
通用催化不对称醛α-烷基化反应的发展构成了有机合成中的主要挑战。在这里,我们报告了第一个成功的解决方法:(S)-α-甲基脯氨酸以优异的产率和对映选择性催化各种卤代醛分子内烷基化为相应的甲酰基环戊烷、-环丙烷或-吡咯烷。最显着的是,外消旋化、醛醇化或催化剂烷基化没有发生任何显着的程度,进一步说明了烯胺催化的能力、温和性和高度选择性。