A new method for synthesizing triterpene 3-O-galactosides, analogs of glycyrrhizic acid (GA) based on 18βglycyrrhetic acid (GLA) methyl esters and 18,19-dehydro-GLA, using 2,3,4,6-tetra-O-acetyl-a-Dgalactopyranosyl bromide as the glycosyl donor, I–Br promoter, and 4-Å molecular sieves was developed. The method could produce primarily 3-O-α-D- or β-D-galactopyranosides depending on the reaction conditions. The 3-O-α-D-galactopyranoside of GLA exhibited an index of selectivity (IS) 2.9 times greater than that of GA for inhibition of accumulation of virus-specific protein p24 of HIV-1. β-D-Galactopyranoside of GLA was more cytotoxic for MT-4 cells and exhibited weak anti-HIV-1 activity.
一种使用2,3,4,6-四-O-合成三萜3-O-半
乳糖苷、基于18β
甘草次酸(G
LA)甲酯和18,19-脱氢-G
LA的
甘草酸(GA)类似物的新方法开发了乙酰-α-D
吡喃半
乳糖基
溴作为糖基供体、I-Br
促进剂和4-Å
分子筛。根据反应条件,该方法可以主要产生 3-O-α-D- 或 β-D-
吡喃半
乳糖苷。 G
LA的3-O-α-D-
吡喃半
乳糖苷在抑制HIV-1的病毒特异性蛋白p24的积累方面表现出比GA高2.9倍的选择性指数(IS)。 G
LA 的 β-D-
吡喃半
乳糖苷对
MT-4 细胞具有更强的细胞毒性,并且表现出较弱的抗 HIV-1 活性。