title: Reinvestigation of the synthesis of per-benzylated glycosylethenes: a new result.
abstract: Addition of vinylmagnesium bromide on the per-benzylated glucono-1,5-lactone gave, after reduction with Et3SiH/BF3.Et2O, a mixture of the desired beta-C-vinyl glucoside 1 and the unexpected beta-C-but-3-enyl glucoside 3 resulting from double addition of vinylmagnesium bromide on the lactone. Similar results have been obtained with the per-benzylated galactono-1,5-lactone. This side reaction was then been explored to prepare beta-C-but-3-enyl glycosides and other beta-C-glycosyl derivatives by employing different Grignard reagents. An alternative approach to the per-benzylated glycosylethenes has been studied and compared.
mesh_terms: D001593:Benzyl Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D005030:Ethylenes / Q000138:chemical synthesis* / Q000737:chemistry; D006027:Glycosides / Q000138:chemical synthesis* / Q000737:chemistry; D007783:Lactones / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry; D010084:Oxidation-Reduction
chemical_list: D001593:Benzyl Compounds; D005030:Ethylenes; D006027:Glycosides; D007783:Lactones; D009942:Organometallic Compounds; C036216:ethylene; D008274:Magnesium