Synthesis of Coumarines and 4H-Chromenes through the Reaction oftert-Butyl Isocyanide and Dialkyl Acetylenedicarboxylates in Presence of 2-Hydroxybenzaldehydes

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Abstract
An effective route to novel coumarines and 4H-chromenes is described. This involves the reaction of tert-butyl isocyanide and dialkyl acetylenedicarboxylates in the presence of 2-hydroxybenzaldehydes.