Synthesis of <scp>l</scp>-Daunosamine and <scp>l</scp>-Ristosamine Glycosides via Photoinduced Aziridination. Conversion to Thioglycosides for Use in Glycosylation Reactions
作者:Matthew T. Mendlik、Peng Tao、Christopher M. Hadad、Robert S. Coleman、Todd L. Lowary
DOI:10.1021/jo061167z
日期:2006.10.1
l-ristosamine glycosides is reported. Photoreaction of methyl 4-O-azidocarbonyl-2,3,6-trideoxy-l-hex-2-enopyranosides, followed by aziridine opening, leads to 3-amino-3-N-,4-O-carbonyl-2,3,6-trideoxy precursors to the aminosugar methyl glycosides. Conversion of these precursors to their thioglycoside analogues followed by N-acetylation of the carbamate moiety permits high yielding and, in some cases, stereoselective
据报道,将光诱导的酰基氮烯叠氮化用于合成l-柔丹胺和1- ristosamine糖苷。甲基4 - O-叠氮基羰基-2,3,6-三苯氧基-1-己-2--2-吡喃侧葡糖苷的光反应,然后打开氮丙啶,导致3-氨基-3- N-,4 - O-羰基-2,3氨基糖甲基糖苷的-6-三甲氧基前体。这些前体转化为其硫代糖苷类似物,然后对氨基甲酸酯部分进行N-乙酰化,可实现高收率,在某些情况下,使用由Crich和其同事开发的1-苯亚磺酰基哌啶-三氟甲磺酸酐活化方法可实现立体选择性糖基化。糖基化涉及N的激活-碘代琥珀酰亚胺和三氟甲磺酸银也成功,但是这些反应的立体选择性通常较低。