The Journal of Organic Chemistry

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 …

B Chantegrel, AI Nadi, S Gelin

Index: Chantegrel, Bernard; Nadi, Abdel Ilah; Gelin, Suzanne Journal of Organic Chemistry, 1984 , vol. 49, # 23 p. 4419 - 4424

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Citation Number: 34

Abstract

Chemical evidence is presented in support of their structures. The lla: 12a ratio can be affected by varying the reaction conditions. By using a 1/1.2/2 molar ratio of 3-acyl- 4hydroxycoumarins (9), hydroxylamine hydrochloride, and potassium acetate, respectively, a series of compounds 11 was obtained in good yields.