iterative process in three steps per cycle that include: (i) thiourea-forming reaction, (ii) deprotection of the hydroxyl groups in the adduct and (iii) generation of a new amino group in the growing chain. Branching points are incorporated by inserting links bearing orthogonal amine functionalities at specific locations in the chain. The approach is illustrated by the preparation of glucopyranosylthiourea
:据报道,基于使用
硫脲基团作为糖间桥,合成准确测序的非
天然糖寡聚体的一般分段策略可以重现
天然寡糖中遇到的分支模式。线性假
寡糖骨架由带有潜在
氨基和异
硫氰酸酯官能团的
单糖结构单元通过每个循环三个步骤的迭代过程构建而成,包括:(i)
硫脲形成反应,(ii) 加合物中羟基的
脱保护(iii) 在生长链中产生新的
氨基。通过在链中的特定位置插入带有正交胺官能团的链接来引入支化点。