A new and direct access to glycono-1,4-lactones from glycopyranoses by regioselective oxidation and subsequent ring restriction
摘要:
Treatment of partially protected or unprotected carbohydrates with the RhH(PPh(3))(4)-benzalacetone system leads exclusively to glycono-1,4-lactones by regioselective oxidation and subsequent ring restriction.
Treatment of partially protected or unprotected carbohydrates with the RhH(PPh(3))(4)-benzalacetone system leads exclusively to glycono-1,4-lactones by regioselective oxidation and subsequent ring restriction.
Aldonhydroximo-lactones. Preparation and Determination of Configuration
作者:Dieter Beer、Andrea Vasella
DOI:10.1002/hlca.19850680821
日期:1985.12.18
D-galactose, D-mannose, 2-acetamido-2-deoxy-D-glucose, D-ribose, and D-arabinose oxime with MnO2, Hg(OAc)2, or O2 in the presence of Cu2Cl2/pyridine are described. An (E/Z)-pair of protected hydroximo-lactones 14 and 15 was obtained by oxidation of the diisopropylidene-D-mannose oxime 13 with MnO2. In CH2Cl2 solution, the minor (E)-isomer 15 was slowly transformed into the major (Z)-isomer 14. The structure