5-Deoxy glycofuranosides by carboxyl group assisted photoinduced electron-transfer deoxygenation
作者:Andrea Bordoni、Rosa M. de Lederkremer、Carla Marino
DOI:10.1016/j.tet.2007.12.005
日期:2008.2
2-O-(3-trifluoromethyl)benzoylated derivative of d-galacturonic acid. The carboxylic group efficiently assists α-deoxygenation, the required irradiation time being significantly shorter than that in the absence of it. The photochemical reaction was also used for the deoxygenation of d-glucurono-6,3-lactone derivatives, providing in both cases the convenientroutes for the synthesis of 5-deoxy-hexofuranosides
A convenient approach to the construction of a galacturonic acid based macrocycle containing an amide group and a triazole ring has been achieved. The key step relies on the efficient formation of a 16-membered ring by a copper-catalysed intramolecular cycloaddition reaction applied to analkyne-azide galacturonate. Depending on the reaction conditions, the outcome of the 1,3-dipolar cycloaddition varied;
NMR Study of uronic acids and their complexation with molybdenum(VI) and tungsten(VI) oxoions
作者:M. Luisa、D. Ramos、M. Madalena、M. Caldeira、Victor M.S. Gil
DOI:10.1016/0008-6215(96)00050-x
日期:1996.6
evidence was gathered for the formation of two 1:2 (metal-ligand) complexes of W(VI) with the furanose forms. These are stronger with d -galacturonic acid and when the β forms are involved. The same was found with Mo(VI), but, in addition, 2:1 complexes also form. In the case of d -galacturonic acid, three such complexes were detected, two involving the α-pyranose form, in an approximately 4 C 1 , and
摘要进行了d-半乳糖醛酸和d-葡萄糖醛酸在水溶液中的多核一维和二维NMR研究,以及它们在不同浓度和pH条件下与钨酸盐和钼酸根离子的络合作用。酸主要以吡喃糖形式存在,但检测到的络合物涉及不稳定的α-和β-呋喃糖异构体以及α-吡喃糖形式。因此,NMR证据收集了呋喃糖形式的W(VI)的两个1:2(金属-配体)配合物的形成。当涉及β形式时,它们对d-半乳糖醛酸更强。对于Mo(VI)也发现了同样的情况,但此外,还形成了2:1的络合物。在d-半乳糖醛酸的情况下,检测到3种此类复合物,其中2种涉及α-吡喃糖形式,分别为大约4 C 1和1 C 4构象。另一个可能涉及β-呋喃糖异构体。用d-葡萄糖醛酸,只能鉴定出一种这样的复合物,它以扭曲的1 C 4构象涉及α-吡喃糖异构体。从1 H,13 C,17 O,95 Mo和183 W NMR数据获得有关各种配合物结构的更详细的信息。具有α-吡喃糖形式的2:1配合物
Proton and carbon-13 nuclear magnetic resonance studies on methyl (methyl d-galactosid)uronates and their per-O-acetyl derivatives
作者:Betty Matsuhiro、Alberto B. Zanlungo、Guy G.S. Dutton
DOI:10.1016/s0008-6215(00)80521-2
日期:1981.11
Abstract The 1H- and 13C-n.m.r.spectra of the anomeric methyl (methyl d -galactosid)uronates, as well as the 1H-n.m.r. spectra of their acetyl derivatives, were analyzed. The spectra of the unacetylated d -galactopyranosiduronates showed good correlation with those of the corresponding anomeric d -galactopyranuronic acids and their methyl esters, and with those of the anomeric methyl d -galactopyranosides
Facile synthesis of methyl α- and β-d-[6-3H]galactofuranosides from d-galacturonic acid. Substrates for the detection of galactofuranosidases
作者:Andrea Bordoni、Carlos Lima、Karina Mariño、Rosa M. de Lederkremer、Carla Marino
DOI:10.1016/j.carres.2008.02.019
日期:2008.7
Galactofuranose metabolism is a good target for the development of novel chemotherapeutic agents for the treatment of some microbial infections. A simple procedure for the synthesis of methyl (methyl alpha,beta-D-galactopyranosid)uronate followed by NaB(3)H(4) reduction gave a straightforward access to radiolabeled substrates for galactofuranosidases. (c) 2008 Elsevier Ltd. All rights reserved.