Synthesis of 3-hexuloses from 1,2:5,6-di-O-isopropylidenehexitols
摘要:
A simple, but low-yielding method for the synthesis of 3-hexuloses has been elaborated. Oxidation of 1,2:5,6-di-O-isopropylidenehexitols with bromine in the presence of barium carbonate, followed by mild-acid hydrolysis of the oxidation products gave the free hexuloses. Oxidation occurred at only one of the carbon atoms bearing free hydroxyl groups. From the D-mannitol derivative, D-arabino-3-hexulose was obtained via the di-O-isopropylidene derivative, whereas the D-glucitol derivative gave a mixture of the 1,2:5,6-di-O-isoprpylidene derivatives of L-xylo- and D-ribo-3-hexulose, separable by column chromatography. Mild-acid hydrolysis of the oxidation products afforded the free hexuloses. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis of 3-hexuloses from 1,2:5,6-di-O-isopropylidenehexitols
摘要:
A simple, but low-yielding method for the synthesis of 3-hexuloses has been elaborated. Oxidation of 1,2:5,6-di-O-isopropylidenehexitols with bromine in the presence of barium carbonate, followed by mild-acid hydrolysis of the oxidation products gave the free hexuloses. Oxidation occurred at only one of the carbon atoms bearing free hydroxyl groups. From the D-mannitol derivative, D-arabino-3-hexulose was obtained via the di-O-isopropylidene derivative, whereas the D-glucitol derivative gave a mixture of the 1,2:5,6-di-O-isoprpylidene derivatives of L-xylo- and D-ribo-3-hexulose, separable by column chromatography. Mild-acid hydrolysis of the oxidation products afforded the free hexuloses. (C) 2001 Elsevier Science Ltd. All rights reserved.
Formation of 3-hexuloses in aldol reactions, analysis of the products as their O-isopropylidene derivatives by GC–MS
作者:Dag Ekeberg、Svein Morgenlie
DOI:10.1016/j.carres.2004.06.018
日期:2004.9
for analysis of mixtures of 3-hexuloses by gas chromatography mass spectrometry of their di-O-isopropylidene derivatives has been elaborated. The origin of characteristic fragment ions in the mass spectra is suggested on the basis of the spectra of d(12) analogues, obtained by acetonation with acetone-d(6) and on MS/MS investigations. The method has been applied to productmixtures from aldol reactions
Synthesis of 3-hexuloses from 1,2:5,6-di-O-isopropylidenehexitols
作者:Dag Ekeberg、Svein Morgenlie、Yngve Stenstrøm
DOI:10.1016/s0008-6215(01)00217-8
日期:2001.9
A simple, but low-yielding method for the synthesis of 3-hexuloses has been elaborated. Oxidation of 1,2:5,6-di-O-isopropylidenehexitols with bromine in the presence of barium carbonate, followed by mild-acid hydrolysis of the oxidation products gave the free hexuloses. Oxidation occurred at only one of the carbon atoms bearing free hydroxyl groups. From the D-mannitol derivative, D-arabino-3-hexulose was obtained via the di-O-isopropylidene derivative, whereas the D-glucitol derivative gave a mixture of the 1,2:5,6-di-O-isoprpylidene derivatives of L-xylo- and D-ribo-3-hexulose, separable by column chromatography. Mild-acid hydrolysis of the oxidation products afforded the free hexuloses. (C) 2001 Elsevier Science Ltd. All rights reserved.