Xiao-Sheng Wang, Gaosheng Yang, Gang Zhao
Apr 3, 2008
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Tetrahedron-asymmetry
Abstract
Abstract An efficient bifunctional thiourea catalyzed addition–cyclization reaction of 2-naphthol with α,α-dicyanoolefins is realized under mild conditions to afford the corresponding naphthopyran derivatives in high yields and moderate enantioselectivities. Additionally, the development of an asymmetric three-component one-pot procedure for the synthesis of naphthopyran derivatives is also reported.