作者:L. N. Atopkina、V. A. Denisenko
DOI:10.1007/s10600-015-1390-9
日期:2015.7
3β,25-Dihydroxy-20S,24R-epoxydammaran-12-one 3- and 25-O-β-D-glucopyranosides were synthesized for the first time. Condensation of 3β,25-dihydroxy-20S,24R-epoxydammaran-12-one (1) with 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosylbromide (3) under Koenigs–Knorr conditions followed by removal of the protecting groups gave regio- and stereoselective formation of 3β,25-dihydroxy-20S,24R-epoxydammaran-12-one 3-O-β-D-glucopyranoside. Glycosylation of 25-hydroxy-20S,24R-epoxydammaran-3,12-dione (2) with 3 followed by treatment of the reaction product with NaBH4 in i-PrOH and deacetylation by sodium methoxide gave 3β,25-dihydroxy-20S,24R-epoxydammaran-12-one 25-O-β-D-glucopyranoside.
首次合成了3β,25-二羟基-20S,24R-环氧达玛烷-12-酮的3-O-β-D-葡萄糖苷和25-O-β-D-葡萄糖苷。在Koenigs-Knorr条件下,3β,25-二羟基-20S,24R-环氧达玛烷-12-酮(1)与2,3,4,6-四-O-乙酰基-α-D-葡萄糖苷溴化物(3)缩合,随后去除保护基团,得到了区域和立体选择性的3β,25-二羟基-20S,24R-环氧达玛烷-12-酮3-O-β-D-葡萄糖苷。将25-羟基-20S,24R-环氧达玛烷-3,12-二酮(2)与3进行糖基化反应,随后用NaBH4在异丙醇中处理反应产物,并用甲氧化钠去乙酰化,得到了3β,25-二羟基-20S,24R-环氧达玛烷-12-酮25-O-β-D-葡萄糖苷。