作者:S. Q. Zhang、J. S. Zhang、C. Z. Wang
DOI:10.1007/s10600-007-0153-7
日期:2007.7
The synthesis of pennogenyl saponins using three important methods of glycosylation is reported in this article. Six correlative compounds (7–12) were first synthesized. As donors (1–6), glycosyl halide, trichloroimidate, and thioglycoside were chosen to study their reaction with the acceptor pennogenin. In these reactions the difference in steric hindrance between 3-OH and 17-OH of pennogenin was utilized skillfully and only the 3-hydroxyl group of pennogenin could be connected with each kind of donors selectively. There was no reaction at the 17-hydroxyl group, which had no protection. The characteristic above makes it convenient to synthesize compounds of pennogenyl saponins.
本文报道了利用三种重要糖基化方法合成Pennogenyl皂苷。首先合成了6个相关化合物(7-12)。作为供体(1-6),选择了糖基卤化物、三氯咪唑和硫代糖苷与受体Pennogenin反应。在这些反应中巧妙地利用了Pennogenin的3-OH和17-OH之间的立体障碍差异,仅使Pennogenin的3-羟基能够选择性地与每种供体连接。未受保护的17-羟基没有反应。上述特点使得合成Pennogenyl皂苷化合物变得方便。