Access to Piperidine Imino-<i>C</i>-glycosides via Stereoselective Thiazole-Based Aminohomologation of Pyranoses
作者:Alessandro Dondoni、Andrea Nuzzi
DOI:10.1021/jo060890m
日期:2006.9.1
with the NH group is described. The key process involves the stereoselective addition of 2-thiazolylmagnesium bromide to an N-glycosylhydroxylamine, i.e., a hidden open-chain sugar nitrone. The N-thiazolylalkylhydroxylamine formed in this way is reduced to amine, and this transformed into a substituted piperidine via intramolecular cyclization by an SN2 process. Cleavage of the thiazole residue attached
描述了通过正式的一碳链延长和环氧与NH基团的交换,从吡喃糖酶获得哌啶高氮天竺葵(双脱氧亚氨基庚糖醇)的方法。关键过程涉及将2-噻唑基溴化镁立体选择性地添加到N-糖基羟胺中,即隐藏的开链糖硝酮。以这种方式形成的N-噻唑基烷基羟胺被还原为胺,并通过S N的分子内环化作用转化为取代的哌啶。2过程。与哌啶环的C 2相连的噻唑残基的裂解显示出甲酰基,并且该甲酰基被还原为羟甲基,从而得到目标高氨氮糖。制备了六种具有游离OH和NH基团并作为盐酸盐分离的立体异构化合物的集合。