Antidiabetogenic oligostilbenoids and 3-ethyl-4-phenyl-3,4-dihydroisocoumarins from the bark of Shorea roxburghii
作者:Toshio Morikawa、Saowanee Chaipech、Hisashi Matsuda、Makoto Hamao、Yohei Umeda、Hiroki Sato、Haruka Tamura、Haruka Kon’i、Kiyofumi Ninomiya、Masayuki Yoshikawa、Yutana Pongpiriyadacha、Takao Hayakawa、Osamu Muraoka
DOI:10.1016/j.bmc.2011.11.067
日期:2012.1
A methanol extract of the bark of Shorea roxburghii (Dipterocarpaceae) was found to inhibit plasma glucose elevation in sucrose-loaded mice. From the extract, three new 3-ethyl-4-phenyl-3,4-dihydroisocoumarins, 1'S-dihydrophayomphenol A(2) (1) and phayomphenols B-1 (2) and B-2 (3), were isolated together with 24 known compounds including 20 stilbenoids and oligostilbenoids. The structures of 1-3 were determined on the basis of their spectroscopic properties as well as of chemical evidences. Among the isolates, (-)-hopeaphenol (6), hemsleyanol D(8), (+)-alpha-viniferin (15), and (-)-balanocarpol (18) showed inhibitory activity against plasma glucose elevation in sucrose-loaded rats at doses of 100-200 mg/kg, p.o. To clarify the mode of action of the antihyperglycemic property, effects of these oligostilbenoids on gastric emptying in mice, those on glucose uptake in isolated intestinal tissues as well as inhibitory activities against rat intestinal cx-glucosidase and rat lens aldose reductase were examined. (C) 2011 Elsevier Ltd. All rights reserved.