A new megastigmane diglycoside from litsea glutinosa (Lour.) C. B. Rob.

Abstract

Phytochemical study on the leaves and twigs of afforded the new megastigmane diglycoside (6S, 7E, 9R)-6, 9-dihydroxy-4, 7-megastigmadien-3-one- 9-O-[α-L-arabinofuranosyl-(l→6)]-β-D-glucopyranoside (1), along with glycosides (6S, 7E, 9R)-roseoside (2), (7'R, 8'R)-3, 5'-dimethoxy-9, 9'-dihydroxy-4, 7'-epoxylignan 4'-β-D-glucopyranoside (3), (7'R, 8'S)-dihydrodehydrodiconifenyl alcohol 9'-O-β-D-xylopyranoside (4) and pinoresinol 3-O-β-D-glucopyranoside (5). Their structures were established on the basis of extensive spectroscopic and chemical methods. Compounds 2-5 were reported for the first time in this species. Compound 1 was evaluated for cytotoxic activities against human tumor cell lines (myeloid leukemia HL-60, hepatocellular carcinoma SMMC-7721, lung cancer A-549, breast cancer MCF-7 and colon cancer SW480 cells), for which it was proved to be inactive (IC 50 > 40 μM). © 2011 Sociedade Brasileira de Química.