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Communication | Regular issue | Vol 22, No. 9, 1984, pp.1951-1954
Published online, 1st January, 1970
DOI: 10.3987/R-1984-09-1951
Synthesis of 2,2-Dimethyl-2H-chromenes

Manuel J. Cortés,* Gabriel R. Haddad, and Jaime A. Valderrama

*Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Correo 22, Santiago, Chile

Abstract

The antijuvenile hormones precocenes I and II (1,2), and related 2,2-dimethyl-2H-chromenes (12,13) were synthesized by oxidative cyclization of o-isoprenylphenols with m-chloroperbenzoic acid, followed by dehydration of the corresponding 3-chromanols with methyltriphenoxyphosphonium iodide.