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Organocatalytic asymmetric synthesis of tetrahydrocarbazoles via an inverse-electron-demand Diels–Alder reaction of 2,3-indole-dienes with enals†
Bo-Qi Gu,Wu-Lin Yang,Shu-Xiao Wu,Yan-Bing Wang,Wei-Ping Deng
Organic Chemistry Frontiers Pub Date : 10/23/2018 00:00:00 , DOI:10.1039/C8QO01042K
Abstract

A novel 2,3-indole-diene synthon was designed and synthesized, and was first applied to a stereoselective inverse-electron-demand Diels–Alder reaction to construct tetrahydrocarbazoles. In the presence of chiral secondary amines, a variety of enantioenriched, multifunctionalized tetrahydrocarbazole derivatives were obtained in good yields (up to 83%) with excellent stereoselectivities (up to >20 : 1 dr, 98% ee).

Graphical abstract: Organocatalytic asymmetric synthesis of tetrahydrocarbazoles via an inverse-electron-demand Diels–Alder reaction of 2,3-indole-dienes with enals
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