作者:Lyubov N. Atopkina、Vladimir A. Denisenko、Nina I. Uvarova、Georgi B. Elyakov
DOI:10.1016/0008-6215(88)85045-6
日期:1988.6
Abstract Glycosylation of the dammar-24-ene-3,12β,20( S )-triols with 2,3,4,6-tetra- O -acetyl-α- d -glucopyranosyl bromide ( A ) in the presence of silver oxide in dichloro-methane gives a mixture of the acetylated 3-, 12-, 20-, 3,12-di-, and 3,20-di- O -β- d -glucopyranosyl derivatives in a total yield of 83–84.5%. Under similar conditions, the 3- O -acetyl derivatives of dammar-24-ene-3,12β,20(
摘要在氧化银存在的条件下,将dammar-24-ene-3,12β,20(S)-三醇与2,3,4,6-四-O-乙酰基-α-d-吡喃葡萄糖基溴化物(A)糖基化二氯甲烷中得到乙酰化的3-,12-,20-,3,12-二-和3,20-二-O-β-d-吡喃葡萄糖基衍生物的混合物,总产率为83-84.5% 。在相似的条件下,达玛-24-烯-3,12β,20(S)-三醇的3-O-乙酰基衍生物得到12-和20-O-β-d-吡喃葡萄糖基衍生物的混合物。在氰化汞存在的条件下,在硝化甲烷中,将异黄酮三醇[dammar-24-ene-3α,12β,20(S)-三醇]与糖基溴化物A和3,4,6-三-O-乙酰基-β缩合-在2,4存在下的d-吡喃葡萄糖1,2-(原乙酸叔丁酯)