Novel synthesis routes for preparation of thiodigalactosides and intermediates are presented. The method includes the use of a 3-azido-galactosyl thiouronium salt derivative, which is activated to the corresponding thiol in situ, which in turn is directly reacted with a 3-azido-galactosyl bromide resulting in the 3,3′-di-azido-thio-di-galactoside before the thiol has a chance to reduce the azido 10 group. Hence, in situ formation of the 3-azido-galactosyl thiol from the thiouronium salt is essential in the synthesis procedure, because any other method that generate the thiol separately results in extensive unwanted azide reduction.
提出了用于制备
硫代半
乳糖苷和中间体的新型合成路线。该方法包括使用3-偶氮基-半
乳糖基
硫脲盐衍
生物,该衍
生物在原位激活为相应的巯基,然后直接与3-偶氮基-半
乳糖基
溴反应,形成3,3'-二偶氮基
硫代二半乳糖苷,此时巯基还没有机会还原偶氮基。因此,在合成过程中原位形成3-偶氮基-半
乳糖基巯基是必要的,因为任何其他单独生成巯基的方法都会导致大量不需要的偶氮基还原。