Highly Enantioselective Friedel−Crafts Reaction of Thiophenes with Glyoxylates: Formal Synthesis of Duloxetine
作者:Jakub Majer、Piotr Kwiatkowski、Janusz Jurczak
DOI:10.1021/ol901906r
日期:2009.10.15
2-substituted thiophenes with alkylglyoxylates has been developed using a catalytic amount of an easy accessible 6,6′-dibromo-BINOL/Ti(IV) complex. A variety of hydroxy(thiophene-2-yl)acetates can be synthesized in high enantioselectivites (92−98% ee) and good yields. This is the first report on the efficient asymmetric F−C reaction of thiophenes with alkylglyoxylates. Starting from simple thiophene and n-butyl