Studies on the Constituents of Leaves of Citrus unshiu MARCOV.

Abstract

Two new glycosides citroside A (3) and B (4), together with 2-phenylethyl β-D-glucopyranoside (1) and 2-phenylethyl D-rutinoside (2), were isolated from the methanol extract of leaves of Citrus unshiu, in addition to two known terpenoids, limonin (5) and friedelin (6).On the basis of spectral and chemical evidence the structures of the new glycosides were determined as (5-dehydroxygrasshopper ketone-5-yl) 5-β-D-glucopyranoside (3) and a (5-dehydroxy-allenic ketodiol-5-yl) 5-β-D-glucopyranoside (4).