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■ Selective Syntheses of Analogues of the Natural Precocenes. Synthesis and Regioselective O-Alkylation of 6-Chloro- and 6-tert-Butyl-7,8-dihydroxy-2,2-dimethyl-4-chromanones

Péter Sebök, Tibor Timár,* Joseph Csaba Jászberényi, and Gyula Batta

*Department of Research, Alkaloida Chemical Co. Ltd., H-4440 Tiszavasvári, POB 1, Hungary

Abstract

The synthesis of novel benzopyran compounds 16 a-f, analogues of the natural precocenes (1 and 2) is described. These derivatives are obtained via novel synthesis and regioselective 0-alkylation of 6-chloro-and 6-tert-butyl-7,8-dihydroxy-2,2-dimethyl-4-chromanones (7 and 12).