Recent Advances in the Synthesis of Coumarin and Its Derivatives by Using Aryl Propiolates

Herein, we have presented a review on the synthesis of coumarin and its derivatives from aryl propiolates during last two decades. It includes the metal-free and as well as metal-mediated cyclization of aryl propiolates to produce functionalized coumarin derivatives via radical or ionic pathway. A number of photo catalysts, oxidants, Lewis's acids and other active additives have been used to perform the transformations.