Dithiasuccinoyl (Dts) amino-protecting group used in syntheses of 1,2-trans-amino sugar glycosides
作者:Ernst Meinjohanns、Morten Meldal、Hans Paulsen、Klaus Bock
DOI:10.1039/p19950000405
日期:——
N-dithiasuccinoyl protecting group was easy to remove by thiolysis using 2-sulfanylethanol or dithiothreitol or reductively using sodium boranuide, thus affording, after N-acetylation, the corresponding N-acetyl-β-D-glucosamine glycosides. It has been demonstrated that it is possible to reduce the Dts group in the presence of an azido group selectively by sodium boranuide or the Dts- and the azido group simultaneously
具有氨基官能团的N-二硫代琥珀酰(N- Dts)保护基的合适的受保护的D-葡糖胺衍生物已经以新的替代途径应用于1,2-反式-糖基化。所述ø - (3,4,6-三- ø -乙酰基-2-脱氧-2- dithiasuccinoylamino-β- d吡喃葡萄糖基)三- chloroacetimidate 7已被用于制备相应的以良好的收率由路易斯酸促进β糖苷。所述Ñ -dithiasuccinoyl保护基团是很容易通过硫解使用2- sulfanylethanol或二硫苏糖醇或还原使用boranuide钠,从而得到去除,之后Ñ-乙酰化,相应的N-乙酰基-β - D-葡糖胺糖苷。已经证明,可以在使用叠氮基的情况下,通过硼氢化钠选择性地还原Dts基团,或者通过二硫苏糖醇通过二硫苏糖醇同时还原Dts-和叠氮基团,使用二异丙基乙胺作为催化剂。构建块的合成。Ñ α -Fmoc-SER(AC 3 -β- d -GlcNDts)-OPfp