Stereoselective α-Glucosylation with Tetra-<i>O</i>-benzyl-α-D-glucose and a Mixture of Trimethylsilyl Bromide, Cobalt(II) Bromide, Tetrabutylammonium Bromide, and a Molecular Sieve. A Synthesis of 3,6-Di-<i>O</i>-(α-D-glucopyranosyl)-D-glucose
作者:Shinkiti Koto、Naohiko Morishima、Chiharu Kusuhara、Shigeko Sekido、Toyosaku Yoshida、Shonosuke Zen
DOI:10.1246/bcsj.55.2995
日期:1982.9
A mixture of trimethylsilyl bromide, cobalt(II) bromide, tetrabutylammonium bromide, and a molecular sieve (4A) is effective for the stereoselective, one-stage α-glucosylation of alcohol with 2,3,4,6-tetra-O-benzyl-α-D-glucopyranose in dichloromethane. Using this procedure, several disaccharide derivatives as well as O-α-D-glucopyranosyl-(1→3)]-O-[α-D-glucopyranosyl-(1→6)]-D-glucopyranose are synthesized
A stereoselective α-glucosylation by use of a mixture of 4-nitrobenzenesulfonyl chloride, silver tri-fluoromethanesulfonate, N,N-dimethylacetamide, and triethylamine
作者:Shinkiti Koto、Naohiko Morishima、Miho Owa、Shonosuke Zen
DOI:10.1016/0008-6215(84)85271-4
日期:1984.7
Abstract Stereoselectiveα-glucosylation of partially protected carbohydrates with 2,3,4,6-tetra-O-benzyl-α- d -glucopyranose in dichloromethane, in the presence of a quaternary mixture of 4-nitrobenzenesulfonylchloride, silvertri-fluoromethanesulfonate, N,N-dimethylacetamide, and triethylamine gave O-α- d -glucopyranosyl-(1→4)- and 1(1→6)-2-acetamido-2-deoxy- d -glucopyranose (N-acetylmaltosamine
DEHYDRATIVE α-GLUCOSYLATION USING A MIXTURE OF<i>p</i>-NITROBENZENESULFONYL CHLORIDE, SILVER TRIFLUOROMETHANESULFONATE,<i>N</i>,<i>N</i>-DIMETHYLACETAMIDE, AND TRIETHYLAMINE
作者:Naohiko Morishima、Shinkiti Koto、Shonosuke Zen
DOI:10.1246/cl.1982.1039
日期:1982.7.5
synthesis of α-linked di- and trisaccharides is performed by the one-stage glucosylation using 2,3,4,6-tetra-O-benzyl-α-D-glucopyranose and a mixture of p-nitrobenzenesulfonyl chloride, silver trifluoromethanesulfonate, N,N-dimethylacetamide, and triethylamine in dichloromethane.