Water-Soluble Constituents of Fennel. IV. Menthane-Type Monoterpenoids and Their Glycosides

Abstract

Two free forms and five glycosyl forms of menthane-type monoterpenoids were isolated from the water-soluble portion of the methanolic extract of fennel. From the spectral evidences, these were characterized as cis-p-menthane-1, 7, 8-triol, trans-p-menthane-1, 7, 8-triol, cis-p-menthane-1, 7, 8-triol 8-O-β-D-glucopyranoside. trans-p-menthane-1, 7, 8-triol 8-O-β-D-glucopyranoside, trans-p-menthane-7, 8-diol 7-O-β-D-glucopyranoside, trans-p-menthane-7, 8-diol 8-O-β-D-glucopyranoside and (4R)-p-menth-1-ene-7, 8-diol 8-O-β-D-glucopyranoside.