Studies on the Reaction of D-Glucal and its Derivatives with 1-Chloromethyl-4-Fluoro-1,4-Diazoniabicyclo[2.2.2]Octane Salts
作者:J. Ortner、M. Albert、H. Weber、K. Dax
DOI:10.1080/07328309908543997
日期:1999.1.1
ABSTRACT The reaction of D-glucal and its derivatives with the electrophilic N-F-fluorination reagents F-TEDA tetrafluoroborate and triflate was studied by means of 19F NMR spectroscopy. In all cases mixtures of 2-deoxy-2-fluoro-D-gluco- and -D-mannopyranose derivatives were formed, the ratio of which was dependent on the nature of the O-protecting groups. Concerning the products arising from the direct
作者:Ewan Boyd、Ray V.H. Jones、Peter Quayle、Anita J. Waring (née Potts)
DOI:10.1016/j.tetlet.2006.08.122
日期:2006.11
3,4,6-Tri-O-methyl-D-glucal, readily prepared from 3,4,6-tri-O-acetyl-D-glucal, undergoes lithiation at -78 degrees C in THF with t-BuLi to afford a vinyl carbanion, which can be trapped with electrophiles in moderate overall yields. The palladium coupling and Dotz-type reactions of these intermediates are also described. (c) 2006 Elsevier Ltd. All rights reserved.