Synthesis of 2-C-(4-aminocarbonyl-2-thiazoyl)-1,4-anhydro-l-xylitols and their fluoro derivatives
摘要:
3,5-O-Benzylidene-2-C-cyano-1,4-anhydro-L-xylitol 7 was synthesized stereoselectively from D-xylose in 7 steps. 2-C-(4-Aminocarbonyl-2-thiazoyl)-1,4-anhydro-L-xylitols and their fluoro derivatives were synthesized from the cyanohydrin 7. Fluorination of compound 9 proceeded with retention of configuration using diethylaminosulfur trifluoride (DAST). (C) 1998 Elsevier Science Ltd. All rights reserved.
Sustainable Synthesis of Chiral Tetrahydrofurans through the Selective Dehydration of Pentoses
作者:Robert W. Foster、Christopher J. Tame、Dejan‐Krešimir Bučar、Helen C. Hailes、Tom D. Sheppard
DOI:10.1002/chem.201503510
日期:2015.11.2
industry. Through use of a hydrazone‐based strategy, L‐arabinose was selectivelydehydrated to form a chiraltetrahydrofuran on a multi‐gram scale without the need for protecting groups. This approach was extended to other biomass‐derived reducing sugars and the mechanism of the key cyclization investigated. This methodology was applied to the synthesis of a range of functionalized chiral tetrahydrofurans
L-阿拉伯糖是甜菜业的废品,是一种丰富的资源。通过使用基于strategy的策略,可以将L-阿拉伯糖选择性脱水以形成几克规模的手性四氢呋喃,而无需保护基团。该方法扩展到其他生物质衍生的还原糖,并研究了关键环化的机理。该方法学被用于一系列功能化的手性四氢呋喃的合成,以及3 R -3-羟基穆斯卡因的正式合成。
Anhydroalditols in the sugar analysis of methanolysates of alditols and oligosaccharide-alditols
作者:Gerrit J. Gerwig、Johannis P. Kamerling、Johannes F.G. Vliegenthart
DOI:10.1016/0008-6215(84)85307-0
日期:1984.7
Abstract In the context of the methanolysis procedure for sugaranalysis, several alditols were investigated for their capacity to form anhydro derivatives in m methanolic HCl (24 h, 85°). Xylitol, d -arabinitol, l -fucitol, d -glucitol, galactitol, 2-acetamido-2-deoxy- d -galactitol, and the alditols of N -acetylneuraminic acid were very prone to form anhydrides, whereas 2-amino-2-deoxy- d -galactitol
Functionalised tetrahydrofuran fragments from carbohydrates or sugar beet pulp biomass
作者:Laure Benhamou、Robert W. Foster、David P. Ward、Katherine Wheelhouse、Lisa Sloan、Christopher J. Tame、Dejan-Krešimir Bučar、Gary J. Lye、Helen C. Hailes、Tom D. Sheppard
DOI:10.1039/c9gc00448c
日期:——
Carbohydrate biomass represents a potentially valuable sustainable source of raw materials for chemical synthesis, but for many applications, selective deoxygenation/dehydration of the sugars present is necessary to access compounds with useful chemical and physical properties. Selectivedehydration of pentose sugars to give tetrahydrofurans can be achieved by treatment of the corresponding N,N-dimethylhydrazones
Intramolecular dehydration of biomass-derived sugar alcohols in high-temperature water
作者:Aritomo Yamaguchi、Natsumi Muramatsu、Naoki Mimura、Masayuki Shirai、Osamu Sato
DOI:10.1039/c6cp06831f
日期:——
The intramolecular dehydration of biomass-derivedsugaralcohols D-sorbitol, D-mannitol, galactitol, xylitol, ribitol, L-arabitol, erythritol, L-threitol, and DL-threitol was investigated in high-temperature water at 523–573 K without the addition of any acid catalysts. D-Sorbitol and D-mannitol were dehydrated into isosorbide and isomannide, respectively, as dianhydrohexitol products. Galactitol was
Abstract The products of dehydration of pentitols in aqueous sulfuric acid have been studied by g.l.c.-m.s. Four isomeric 1,4-anhydropentitols were formed from d -arabinitol, but only two from xylitol and ribitol. The number of products could only be explained by assuming inversion of configuration at C-2 or C-4 during 1,4- or 2,5-cyclisation reactions. No product which involved inversion of configuration