Glycosylation reaction of 2,3-di-O-benzoyl-protected galactosyl donors with ethyl thioglucoside acceptor to prepare lactose derivatives was investigated. The presence of benzyl ether moieties at the 4 and 6 positions of the donor drove the glycosylation reaction to completion and blocked the intermolecular aglycone transfer reaction with thioglucoside. On the other hand, the presence of benzoyl moieties at those positions promoted the intermolecular aglycone transfer reaction with thioglucoside.
研究了 2,3- 二-O-苯甲酰基保护半
乳糖基供体与乙基
硫代
葡萄糖苷受体的糖基化反应,以制备
乳糖衍
生物。在供体的 4 和 6 位上存在苄基醚分子会促使糖基化反应完成,并阻断与
硫代
葡萄糖苷的分子间
琼脂酮转移反应。另一方面,这些位置上苯甲酰基的存在促进了与巯基
葡萄糖苷的分子间
琼脂酮转移反应。