deallylation. The derivatives 5 and 8 were used for solid phase synthesis of glycopeptides related to HIV gp120 and mucins. In these syntheses piperidine was found to give efficient Fmoc removal whereas deprotection with morpholine was slow and incomplete for some steps. In contrast to previous concerns β-elimination and epimerization of glycopeptide stereocenters was not encountered when piperidine
在Tn的抗原[将Fmoc-
丝氨酸/苏
氨酸(AC的被保护的衍
生物3 GalNAcα)-OH,化合物5和8 ]已经制备通过将Fmoc-
丝氨酸/苏
氨酸- O-
烯丙基糖基化与3,4,6-三- ø -
乙酰基-2-
叠氮基-2-
脱氧-D-
吡喃半
乳糖基
氯(2),然后将
叠氮基转化为乙
酰胺并
脱脱甲酰。导数5和8用于固相合成与HIV gp120和粘蛋白有关的糖肽。在这些合成中,发现
哌啶可有效去除Fmoc,而
吗啉的
脱保护作用缓慢且在某些步骤中不完全。与先前的关注相反,当
哌啶用于Fmoc
脱保护时,没有遇到糖肽立体中心的β-消除和差向异构化。然而,发现对于糖肽而言,其侧链
脱保护并从固相切割。