17184-28-0Relevant articles and documents
Acyloxonium ions in the high-yielding synthesis of oxolanes from alditols, hexoses, and hexonolactones catalysed by carboxylic acids in anhydrous hydrogen fluoride
Defaye, Jacques,Gadelle, Andree,Pedersen, Christian
, p. 191 - 202 (2007/10/02)
Treatment of D-glucono-1,5- or D-mannono-1,4-lactone with anhydrous hydrogen fluoride catalysed by formic or acetic acid yields 3,6-anhydro-D-glucono- and -D-mannono-1,4-lactone, respectively.Similarly, D-mannitol is converted into 1,4-anhydro-D-mannitol and subsequently into the 1,4:3,6-dianhydride, whereas D-glucitol forms exclusively the 3,6-anhydride and, on further reaction, 1,4:3,6-dianhydro-D-glucitol.D-Glucose and 2-acetamido-2-deoxy-D-glucose are also converted into the corresponding 3,6-anhydrides by reaction with hydrogen fluoride and formic acid.13C-N.m.r. spectroscopy indicates that the reactions involve intermediate dioxolanyium ions.
Methyl 2,5:3,6-Dianhydro-D-mannofuranosides
Koell, Peter,Metzger, Juergen O.,Meyer, Bernd
, p. 1345 - 1353 (2007/10/02)
Monotosylation of methyl 3,6-anhydro-β-D-glucofuranoside gives as minor reaction product 1 which yields by treatment with sodium ethanolate methyl 2,5:3,6-dianhydro-β-D-mannofuranoside (2).The α-anomer 6 is equally prepared from 3 which is obtained by selective monotosylation of methyl 3,6-anhydro-β-L-gulofuranoside.Reaction of methyl 3,6-anhydro-2,5-di-O-tosyl-α-D-glucofuranoside (5) gives only small amounts of 6 accompanied by the monotosylate 4.Mass and NMR spectra (2D-1H and 13C) of the new dianhydrides 2 and 6 are described.