Asymmetric One-Pot Sequential Organo- and Gold Catalysis for the Enantioselective Synthesis of Dihydropyrrole Derivatives
作者:David Monge、Kim L. Jensen、Patrick T. Franke、Lennart Lykke、Karl Anker Jørgensen
DOI:10.1002/chem.201001123
日期:2010.8.16
A direct asymmetric one‐pot synthesis of optically active 2,3‐dihydropyrroles from propargylated malononitrile and N‐Boc‐protected (Boc=tert‐butoxycarbonyl) imines is presented. The approach is based on a bifunctional organocatalytic Mannich‐type reaction and a subsequent gold‐catalyzed alkyne hydroamination and isomerization. The compatibility of both catalytic systems is presented and the overall
提出了由炔丙基化丙二腈和N -Boc保护的(Boc =叔丁氧基羰基)亚胺直接光学活性2,3-二氢吡咯的不对称一锅合成方法。该方法基于双功能有机催化曼尼希型反应以及随后的金催化炔烃加氢胺化和异构化。提出了两种催化体系的相容性,总转化率可实现高收率(内/外> 10:1)和对映体选择性(ee高达88%), 产率高(高达70%))。通过X射线分析可以明确地确定最终产品的绝对配置。为了突出所获得的杂环化合物的合成潜力,现将其转化为1-吡咯啉,它们代表吡咯烷的直接前体。