Novel and facile syntheses of benzodipyrans, acetylchramenes and pyranol[1,2]benzisoxazoles from 2,4- and 4,6-diacetylresorcinols have been described. Regioselective condensations and reductions have been used as the key steps.
A. Banerji and Kalena, G. P., “Heterocycles from diacetyl phenols: synthesis of benzodipyrans, acetylchromenes and pyrano [1, 2] benzisoxazoles (Invited Contribution)”, Heterocycles, vol. 28, pp. 711–718, 1989.