Synthesis of 3-substituted coumarins from 2-(acyloxy)arylaldehydes using the TiCl4/R3N reagent system

3-Substituted coumarins are formed in 37–63% yields by the reaction of 2-(acyloxy)arylaldehydes with the TiC 4 /R 3 N reagent system. The structure of the compound 2c was determined by single crystal X-ray analysis.