2-O-Acetyl-3-O-allyl-4-O-benzyl-6-O-tert-butyldiphenylsilyl-D-gluc opyranosyl chloride (14), a glycosyl donor suitable for synthesis of oligosaccharides corresponding to the N-glycoprotein saccharide "core", was synthesized by an efficient, six-stage route from 3,4,6-tri-O-acetyl-1,2-O-[1-(exo-ethoxy)ethylidene)-alpha-D-glucopyranos e. Silver triflate-promoted coupling of 14 with benzyl 2-acetamido-3
2-O-乙酰基-3-O-烯丙基-4-O-苄基-6-O-叔丁基二苯基甲
硅烷基-
D-葡萄糖吡喃糖基
氯(14),一种适合合成对应于N-糖
蛋白糖的
寡糖的糖基供体“核心”是由3,4,6-三-O-乙酰基-1,2-O- [1-(外-乙氧基)亚乙基)-α-
D-吡喃葡萄糖通过高效的六步路线合成的。由
三氟甲磺酸银促进的14与苄基2-乙酰
氨基-3,6-二-O-苄基-2-脱氧-α-
D-吡喃葡萄糖苷的偶联产生了受保护的与β-D-(1 ---- 4)连接的二糖收率38%,但也发生了主要的副反应。当在偶联反应之前将叔丁基二苯基甲
硅烷基从14定量除去后再取代时,糖苷化的产率增加到55%,并且避免了主要副产物。