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Quinine-catalyzed highly enantioselective cycloannulation of o-quinone methides with malononitrile†
Alafate Adili,Zhong-Lin Tao,Dian-Feng Chen,Zhi-Yong Han
Organic & Biomolecular Chemistry Pub Date : 01/06/2015 00:00:00 , DOI:10.1039/C4OB02602K
Abstract

2-Amino-3-cyano-4H-chromenes show great potential as novel anticancer agents. Here we report a quinine-catalyzed highly enantioselective formal 4 + 2 cycloaddition of ortho-quinone methides and malononitrile, providing a unique approach to 4-arylvinyl, 4-aryl and 4-vinyl 2-amino-3-cyano-4H-chromenes with excellent yields and enantioselectivities. Moreover, this reaction can be performed in up to 6 mmol scale without any noticeable loss of yield and stereoselectivity.

Graphical abstract: Quinine-catalyzed highly enantioselective cycloannulation of o-quinone methides with malononitrile
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