Three Megastigmane Glycosides from the Leaves of Pterospermum semisagittatum

S. H. Khan Department of Chemistry, University of Dhaka, Dhaka, 1000, Bangladesh

M. Mosihuzzaman Department of Chemistry, University of Dhaka, Dhaka, 1000, Bangladesh

N. Nahar Department of Chemistry, University of Dhaka, Dhaka, 1000, Bangladesh

M. A. Rashid Department of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh

B. Rokeya Research and Academy Division, Bangladesh Institute of Research and Rehabilitation in Diabetes, Endocrine and Metabolic Disorders (BIRDEM), Dhaka, 1000, Bangladesh

L. Ali Research and Academy Division, Bangladesh Institute of Research and Rehabilitation in Diabetes, Endocrine and Metabolic Disorders (BIRDEM), Dhaka, 1000, Bangladesh

A. K. Azad Khan Research and Academy Division, Bangladesh Institute of Research and Rehabilitation in Diabetes, Endocrine and Metabolic Disorders (BIRDEM), Dhaka, 1000, Bangladesh

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Abstract

Pterospermum semisagittatum leaves yielded three megastigmane glycosides (Z)-4-[3′-(β-D-glucopyranosyloxy) butylidene]-3,5,5-trimethyl-2-cyclohexen-1-one (1), (E)-4-[3′-(β-D-glucopyranosyloxy)butylidene]-3,5,5-trimethyl-2-cyclohexen-1-one (2) and (E)-4-hydroxy-4-[3′-(β-D-glucopyrano syloxy)butylidene]-3,5,5-trimethyl-2-cyclohexen-1-one (3). Their structures were established by detailed spectroscopic studies. Compound 3 showed a significant insulin releasing effect on rat pancreatic islets.

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Three Megastigmane Glycosides from the Leaves of Pterospermum semisagittatum

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