Preparation of Multivalent Carbohydrate Mimetics Based on Enantiopure 1,2-Oxazines by Sonogashira Coupling and Subsequent Reductive Ring-Opening
作者:Maja Kandziora、Hans-Ulrich Reissig
DOI:10.1002/ejoc.201403186
日期:2015.1
modular approach to aryl C-glycosides and their multivalent analogues is presented. Sonogashira coupling reactions connected the key compounds, enantiopure bicyclic 1,2-oxazine derivatives bearing p-bromophenyl substituents, with alkynes. Subsequent hydrogenolyses or a combination of hydrogenolysis and samarium diiodide mediated reductions converted the coupling products into new unnatural amino carbohydrate
Synthesis of rigid <i>p</i>-terphenyl-linked carbohydrate mimetics
作者:Maja Kandziora、Hans-Ulrich Reissig
DOI:10.3762/bjoc.10.182
日期:——
2-oxazine, was prepared by a stereoselective [3 + 3]-cyclization of a D-isoascorbic acid-derived (Z)-nitrone and lithiated TMSE-allene. The Lewis acid-induced rearrangement of this heterocycle provided the corresponding bicyclic 1,2-oxazine derivative that may be regarded as internally protected amino sugar analogue. After subsequent reduction of the carbonyl group, the resulting bicyclic compound was used