Operationally simple and convenient synthesis of selectively protected derivatives of 5,7-dihydroxycoumarins was proposed. The proposed method is based on the reaction of the coumarins with nicotinoyl azide yielding 7-nicotinoyloxy derivatives of the coumarins. This approach can significantly improve the procedure for preparing the dimethylpyranocoumarins, an important semiproduct for synthesis of anti-HIV agents.

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