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.
2-氨基-3-氰基-4H-色酮显示出作为新型抗癌药物的巨大潜力。在这里,我们报告了奎宁催化的高度对映选择性的正式4 + 2环加成,将邻醌甲烯和丙二腈进行反应,提供了一种独特的方法来合成4-芳基乙烯基,4-芳基和4-乙烯基2-氨基-3-氰基-4H-色酮,产率和对映选择性均非常优异。