Isolation of keto alcohol and triterpenes from tubers of Cyperus rotundus Linn.

Perwez Alam, Mohd. Ali and Vid

Abstract

Phytochemical investigation of the methanolic extract of the tubers of Cyperus rotundus L. (Cyperaceae) led to the isolation of one new keto alcohol characterized as n-tricont-1-ol-21-one, two new triterpenic glucosides 18α-H-urs- 12-en-3 β-ol- β-D-glucuronopyranoside (18-epi-α-amyrin glucuronoside) and 3 β-hydroxyolean-12-en-28-oic acid α-D-arabinofuranoside (oleanolic acid arabinoside) along with the known compounds Urs-12-en-3β–ol-3-β-Dglucopyranoside (α -Amyrin glucopyranoside), Olean-12-en-3β–ol-3-β-D- glucopyranoside (β -Amyrin glucopyranoside). The structures of all these phytoconstituents have been elucidated on the basis of 1H NMR, 13C NMR, and FAB MS spectral data analysis and chemical reactions.