作者:P.K. Dutta、N.L. Dutta、R.N. Chakravarti
DOI:10.1016/s0031-9422(00)88483-6
日期:1972.3
% (Fragment b); 189, 70% (a-CH,OH-C-2H and b-H,O). The triterpene (I) on oxidn. with Jones reagent’ followed by esterification with CH2N2 and subsequent purification by chromatography on silica gel furnished a compd. ; m.p. 192”, [a]u +78”, v~~~:jx”’ 1700 cm-l ()C=O), 1730 cm-’ (-COOCH,), identical with methyl ursonate (m.p., m.m.p., [a],, IR, TLC). This indicated the triterpene to be an epimer of uvaol
植物。柿属蒙大拿。用途。Medicinal.lV3 以前的工作。在茎皮上。4 植物的干燥叶子用石油醚提取,提取物在中性氧化铝上进行色谱分离。轻质石油苯(4:1)馏分提供羽扇豆醇,C30HS00(mp,mmp,[a],IR,TLC;mp,mmp和[~a],乙酸酯)。轻质石油-苯 (1:2) 馏分提供谷甾醇 C29H500(mp、mmp 和 [u]n;mp、mmp 和 [a]u 乙酸盐)和豆甾醇,C29H480(mp、mmp 和 [u]n;mp , mmp 和 [u],, 醋酸盐)。苯-醚 (4: 1) 馏分得到表皮乌醇,一种新的三萜 (I),C30H5002 (M+ 442),mp 212-214”,[u]b +49*7”,VN ,U,!,' 3300 cm-' (-OH) 和桦木脑,C30H5002 (mp, mmp, [a],,,, IR; mp, mmp 和 [u]b 醋酸盐)。通过在浸渍硅胶的