Synthesis of Chromanochromanone and 2-Substituted Isoflavanones

Synthesis of Rotenoids I

Abstract

Six new 2-substituted isoflavanones were obtained by catalytic hydrogenation of the corresponding isoflavones. Under the same condition, chromenochromon was reduced to chromanochromanone which was the main skeletal unit of rotenoids. The steric configuration of these compounds is discussed.