Structures of rengyol, rengyoxide, and rengyolone, new cyclohexylethane derivatives from Forsythiasuspensa fruits

Abstract

Three new C6–C2 natural alcohols, rengyol (1), rengyoxide (2), and rengyolone (3), have been isolated from Forsythiasuspensa fruits, along with a novel glycoside, forsythoside E (4), a new sugar ester, 4-caffeoylrutinose, and a known quinol glucoside, cornoside (5). Chemical and spectroscopic studies have established the structures of these new constituents.