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Asymmetric conjugate additions of 2-substituted benzofuran-3(2H)-ones to α,β-unsaturated ketones catalyzed by chiral copper complexes†
Haojiang Wang,Yifeng Wang,Cheng Zhang,Yidong Jiang,Mingming Chu,Zhaobo Li,Xiaohua Du,Danqian Xu
Organic & Biomolecular Chemistry Pub Date : 04/18/2017 00:00:00 , DOI:10.1039/C7OB00677B
Abstract

A highly enantioselective conjugate addition of 2-substituted benzofuran-3(2H)-ones to α,β-unsaturated ketones promoted by chiral copper complexes has been developed, affording the Michael addition products with quaternary stereocenters in good to high yields (up to 95% yield) with excellent enantioselectivities (up to 99% ee). The chiral Michael adducts could be readily converted to the polycyclic benzofuran-type framework via the Robinson annulation.

Graphical abstract: Asymmetric conjugate additions of 2-substituted benzofuran-3(2H)-ones to α,β-unsaturated ketones catalyzed by chiral copper complexes
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