Chlorination of 1,5-anhydro-4,6,-o-benzylidene-2,3-dideoxy-3-nitro-D-arabino-hex-1-enitol; highly stereoselective preparation of α-D-glucopyranosyl chloride and ω-chloroalkyl β-D-glucopyranosides
Stereochemistry of Nucleophilic Addition Reactions. VIII. Preparation of 1,5-Anhydro-4,6-<i>O</i>-benzylidene-2,3-dideoxy-3-nitro-D-<i>erytho</i>-hex-2-enitol and Its Reactions with Some Nucleophiles
作者:Tohru Sakakibara、Yutaka Nomura、Rokuro Sudoh
DOI:10.1246/bcsj.53.1642
日期:1980.6
having an axial and equatorial deuterium atom at C-2 in an approximate ratio of 2:1. On the other hand, the reaction with hydrogen cyanide gave predominantly the adduct with the manno configuration, together with small amounts of a cyano olefin. The reaction with hydrazoic acid yielded addition products with the gluco and manno configurations; the ratio was strongly affected by the solvent used.
Abstract 4,6- O -Benzylidenehex-2-enopyranoside derivatives having a 2- C - or 3- C-p -tolylsulfonyl group were synthesized from appropriate nitrosugars by the addition of p -toluenesulfinic acid followed by elimination of nitrous acid. 1,5-Anhydro-4,6- O -benzylidene-2,3-dideoxy-2- C-p -tolylsulfonyl- d - erythro -hex-2-enitol was similarly prepared. Methyl 4,6- O -benzylidene-2,3-dideoxy-2- C -
Preparation and structural determination of methyl 4,6-O-benzylidene-2,3-dideoxy-β-d-erythro-hexopyranosid[2,3-d]triazole and of its adducts with 3-nitrohex-2-enopyranosides
(1 S )-1,5-anhydro- d -(1, 2 H)glucitol and subjected to an additionreaction with methyl 4,6- O -benzylidene-2,3-dideoxy-β- d - erythro -hexopyranosid-[2,3- d ]-triazole, derived from the nitro alkene with lithium azide. The structure of the adducts was, by 1 H-n.m.r. spectroscopy, assigned the d - gluco configuration for the nitrosugar moiety.