Catalytic Synthesis of Coumarins via Direct Annulations of alpha,beta-Unsaturated Aldehydes and Salicylaldehydes

[摘要]：The first organocatalytic approach towards substituted coumarins is reported. Catalytic amounts of in situ generated N-heterocyclic carbenes (NHC) catalyze a one-pot redox esterification of alpha,beta-unsaturated aldehydes with simultaneous aldol condensation.

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