Regioselective methylation of methyl glycopyranosides with diazomethane in the presence of transition-metal chlorides and of boric acid
作者:Evgeny V. Evtushenko
DOI:10.1016/s0008-6215(99)00044-0
日期:1999.3
Abstract Partial methylation of the methyl pyranosides of a number of pentoses, hexoses, 6-deoxyhexoses, methyl uronates and their methyl ethers with diazomethane in the presence of transition-metal chlorides and boric acid was studied. It was found for methyl glycosides of pentoses and 6-deoxyhexoses that tin(II), antimony(III), and titanium(IV) chlorides as well as boric acid promoted substitution
A convenient method for the preparation of all of the partially methylated derivatives of methyl α-d-mannopyranoside and α-d-galactopyranoside
作者:Tomohiro Mega、Atsushi Nishikawa、Tokuji Ikenaka
DOI:10.1016/0008-6215(83)88296-2
日期:1983.2
Gas-liquid chromatography-mass spectrometry of methylated and deuteriomethylated per-O-acetyl-aldononitriles from D-mannose
作者:Fred R. Seymour、Ronald D. Plattner、Morey E. Slodki
DOI:10.1016/s0008-6215(00)84162-2
日期:1975.11
D-mannopyranose were separated by gas-liquidchromatography, and analyzed by mass spectrometry. Through introduction of deuteriomethyl ether groups, various fragmentions constituting the mass spectra were identified and related to the parent methylated sugar structures. Also identified were several characteristic series of fragment ions that are common to two or more methylated D-mannopyranosides. As expected