Stereocontrolled Synthesis of <scp>d</scp>- and <scp>l</scp>-β-Rhamnopyranosides with 4-<i>O</i>-6-<i>S</i>-α-Cyanobenzylidene-Protected 6-Thiorhamnopyranosyl Thioglycosides
作者:David Crich、Linfeng Li
DOI:10.1021/jo8022439
日期:2009.1.16
The synthesis of both enantiomers of a 4-O-6-S-α-cyanobenzylidene-protected 6-thiorhamnopyranosyl thioglycoside is described starting from d-mannnose and l-arabinose derivatives for the d- and l-series, respectively. This donor is effective in the preparation of the corresponding β-glycosides using the 1-benzenesulfinyl piperidine/trifluoromethanesulfonic anhydride protocol. Following desulfurization
Synthesis and 13C-n.m.r. spectra of β-l-rhamnopyranosides
作者:Leon V. Backinowsky、Nikolay F. Balan、Alexander S. Shashkov、Nikolay K. Kochetkov
DOI:10.1016/s0008-6215(00)85553-6
日期:1980.9
Abstract Syntheses of methyl β- l -rhamnopyranoside, 6- O -β- l -rhamnopyranosyl- d -glucose and - d -galactose, and 4- O -β- l -rhamnopyranosyl- l -rhamnose, based on the use of 4- O -acetyl-2,3- O -carbonyl-α- l -rhamnopyranosyl bromide as glycosylating agent, are described. The 13 C-n.m.r. spectra of β- l -rhamnosides are compared with those of the respective α anomers.