Highly stereoselective Friedel–Crafts type cyclization. Facile access to enantiopure 1,4-dihydro-4-phenyl isoquinolinones
作者:Nicolas Philippe、François Denivet、Jean-Luc Vasse、Jana Sopkova-de Olivera Santos、Vincent Levacher、Georges Dupas
DOI:10.1016/s0040-4020(03)01236-5
日期:2003.9
stereoselective synthesis of 1,4-dihydro-4-phenyl isoquinolinones 5 based on a stereoselective Friedel–Crafts type cyclization. Cyclization precursors 1 were prepared in two steps, from the readily available (S)-mandelic acid, in 60–80% overall yield. The stereoselective electrophilic cyclization was accomplished in 20–86% yield and with 20–97% ee. In the course of this work, the presence of the amide
本报告介绍了基于立体选择性Friedel-Crafts型环化反应的1,4-二氢-4-苯基异喹啉酮5的立体选择性合成。环化前体1由易于获得的(S)-扁桃酸分两步制备,总收率为60-80%。立体选择性亲电环化以20-86%的收率和20-97%的ee完成。在这项工作的过程中,发现酰胺羰基的存在对于确保亲电芳族取代过程中的立体定向过程特别重要。