Diastereoselective radical reactions : β-face selective quenching of the 1,2-O-isopropylidene-3,4,6-tri-O-benzyl-d-glucopyranos-1-yl radical
                                
                                    
                                        作者:David Crich、Linda B.L. Lim                                    
                                    
                                        DOI:10.1016/s0040-4039(00)78786-7
                                    
                                    
                                        日期:1991.6
                                    
                                    Pyrolysis of 3,4,6-tri-O-benzyl-1-carbomethoxy-1,2-dideoxy-1-phenylsulfonyl-D-glucopyranose provides the corresponding 1-carbomethoxyglucal which reacts with osmium tetroxide to form a gluco-diol.  This diol is converted to an acetonide which is saponified and subjected to the Barton reductive decarboxylation procedure with exclusive quenching of the intermediate radical from the beta-face representing the first example of a reaction in which a glucopyranosyl radical is selectively quenched from this direction.  An improved procedure for the preparation of 3,4,6-tri-O-benzyl-D-glucopyranose is presented.