Synthesis of [1]benzopyrano[3,4-d]isoxazol-4-ones from 2-substituted chromone-3-carboxylic esters. A reinvestigation of the reaction of 3-acyl-4-hydroxycoumarins with hydroxylamine. Synthesis of 4-(2-hydroxybenzoyl)isoxazol-5-ones
Synthesis of [1]benzopyrano[3,4-d]isoxazol-4-ones from 2-substituted chromone-3-carboxylic esters. A reinvestigation of the reaction of 3-acyl-4-hydroxycoumarins with hydroxylamine. Synthesis of 4-(2-hydroxybenzoyl)isoxazol-5-ones