Efficient procedure for the preparation of 4-methyl-2-thiocoumarins by the reaction of 4-methylcoumarins with Lawesson's reagent

摘要

A simple and convenient method has been worked out for the preparation of 4-methyl-2-thiocoumarins by the reaction of the appropriate 4-methylcoumarins with Lawesson's Reagent in hot anhydrous toluene.