反应详情

Resorcinol (5.5 g) and 7.2 g of ethyl 2-methylacetoacetate were stirred at 10° C. for 3 hours in the presence of a catalytic amount concentrated sulfuric acid to give 7.8 g (yield 83%) of 3,4-dimethyl-7-hydroxycoumarin. The product was hydrogenated and dehydrated as in Referential Example 16 to give 5.7 g (78%) of the desired product as a pale brown liquid.