XANTHONES IN HETEROCYCLIC SYNTHESIS. AN EFFICIENT AND GENERAL ROUTE FOR THE SYNTHESIS OF REGIOSELECTIVELY SUBSTITUTED PHTHALAZINES

[摘要]：Xanthone undergoes regioselective substitution and nucleophically triggered ring opening to the corresponding ketone. Hydrazone of the latter oxidatively rearranges to ortho-diacylarenes, which, then, with hydrazine gives regioselectively substituted phthalazines. Molecular modeling analysis and (1)H NMR spectra indicate an intramolecular H-bonding engaging phenol OH and phthalazine N-3 atom.

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