Deoxy-nitrosugars. 6th communication. Stereoelectronic control in the reductive denitration of tertiary nitro ethers. A synthesis of ?C-glycosides?
作者:Franz Baumberger、Andrea Vasella
DOI:10.1002/hlca.19830660733
日期:1983.11.2
The separate, radical denitration with Bu3SnH of the pyranose derivatives 3, 4, 9, and 10 gave in good yields exclusively the ‘C-glycosides’ 5 and 11, respectively (Scheme 1). Similar reduction of the cyclohexyl derivatives 15, 16, 19 and 20 gave 4:1 mixtures of 17, 18, 21 and 22, respectively, always with predominant formation of an axial C,H-bond. In the furanose series a divergent behaviour was
Synthesis of β-<i>C</i>-Glycopyranosyl Aldehydes and 2,6-Anhydro-heptitols
作者:Vinod Khatri、Amit Kumar、Balram Singh、Shashwat Malhotra、Ashok K. Prasad
DOI:10.1021/acs.joc.5b01933
日期:2015.11.6
β-C-glycopyranosyl aldehydes from d-glucose, d-mannose, and d-galactose. The key step in the synthesis of C-glycosyl aldehydes is the aryl driven reductive dehydration on 1-phenyl-2-(2′,3′,4′,6′-tetra-O-acetyl-β-d-glycopyranosyl)ethanone to afford alkenes, which on oxidation afford the desired compounds in good yield. β-C-Glycopyranosyl aldehydes have been converted to 2,6-anhydro-heptitols in quantitative
Syntheses of 2,6-anhydroaldonic acids from the corresponding anhydrodeoxynitroalditols (glycopyranosylnitromethanes) and their conversion into methyl esters, amides, and alditols
作者:Manfred Dromowicz、Peter Köll
DOI:10.1016/s0008-6215(98)00195-5
日期:1998.9
Abstract 2,6-Anhydroaldonic acids were obtained by oxidation of the corresponding anhydrodeoxynitroalditols (glycopyranosylnitromethanes) with hydrogen peroxide in alkaline solution. Purification was achieved via the methyl anhydroaldonates. The syntheses of five 2,6-anhydrohexonic and eight 2,6-anhydroheptonic acids were accomplished in yields of 44–81%. All corresponding unprotected and acetylated