N-Nosyl as a stereoselectivity-improving and easily removable group in the O-glycosylation of d-allal and d-galactal-derived allyl aziridines. Stereospecific synthesis of 4-amino-2,3-unsaturated-O-glycosides
作者:Valeria Di Bussolo、Maria Rosaria Romano、Mauro Pineschi、Paolo Crotti
DOI:10.1016/j.tet.2006.12.069
日期:2007.3
The glycosylation of alcohols, phenol, and partially protected monosaccharides with the diastereoisomeric d-allal and d-galactal-derived N-nosyl aziridines 2α and 2β leads to the corresponding 4-N-(nosylamino)-2,3-unsaturated-α-O- (6α) and β-O-glycosides and disaccharides (6β), respectively, in a stereospecific substrate-dependent O-glycosylation process. The N-(nosylamino) group of 6α and 6β can easily
醇,苯酚和部分受保护的单糖与非对映异构体的d- allal和d-galactal衍生的N - nosyl氮丙啶2α和2β的糖基化反应会导致相应的4- N-(nosylamino)-2,3-unsaturated-α- O-(6α)和β- O-糖苷和二糖(6β)分别在立体特异性底物依赖性O-糖基化过程中产生。6α和6β的N-(nosylamino)基团 可以很容易地脱保护,得到相应的4-氨基-2,3-不饱和-O-糖苷7α和7β,对我们的糖基化方案具有更高的价值。