Enantioselective vinylogous Michael addition of β,γ-unsaturated butenolide to 2-iminochromenes†
Abstract
An efficient organocatalyzed asymmetric synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles via vinylogous Michael addition of non-activated β,γ-unsaturated butenolide to 2-iminochromenes has been realized.