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The reactive intermediate generated by the addition of alkyl isocyanides to dialkyl acetylenedicarboxylate are trapped by 3-hydroxyisoquinoline to produce highly functionalized 4H-chromenes in 83-92% yields.

journal of advances in chemistry

Convenient one-step Synthesis of Substituted Pyrano[2,3-c]isoquinoline (2-amino-4H-chromenes) via three Component Reaction between Alkyl isocyanides and Dialkyl Acetylenedicarboxylate in the presence of 3-Hydroxyisoquinoline