Synthesis of 5-amino-5-deoxy-d-galactopyranose and 1,5-dideoxy-1,5-imino-d-galactitol, and their inhibition of α- and β-d-galactosidases
作者:Günter Legler、Stefan Pohl
DOI:10.1016/s0008-6215(00)90138-1
日期:1986.11
chlorobenzene. α- d -Galactosidase from coffee beans and from Escherichia coli and β- d -galactosidase from E. coli and Aspergillus wentii were inhibited with K i values that ranged from 0.0007 to 8.0μ m . Formation of the enzyme-inhibitor complexes with the d -galactose analogue was on the time-scale of minutes, whereas the d -galactitol analogue showed a slow approach to the inhibition only with α- d -galactosidase
摘要提出了从1,2:5,6-二-O-异亚丙基-α-d-葡萄糖呋喃糖开始的十二步合成方法,用于制备标题化合物及其左旋类似物。它们的合成是基于用阮内镍还原1-阿拉伯糖基己糖呋喃糖-5-ulose的受保护的5-羟基亚氨基衍生物,以及制备ad-半乳糖呋喃糖衍生物的以下改进:在C-3上用重铬酸吡啶鎓氧化-乙酸酐,将3-O-乙酰基-己-3--3-呋喃呋喃糖中间体立体定向还原为d-古洛衍生物,并用乙酸四丁铵在氯苯中的C-3转化其3-甲苯磺酸酯。来自咖啡豆和大肠杆菌的α-d-半乳糖苷酶以及来自大肠杆菌和戈氏曲霉的β-d-半乳糖苷酶的K i值在0.0007至8.0μm范围内。与d-半乳糖类似物形成酶抑制剂复合物的时间为数分钟,而d-半乳糖醇类似物显示出仅用咖啡豆中的α-d-半乳糖苷酶和β-d-抑制作用的缓慢方法。半乳曲霉的半乳糖苷酶。d-半乳糖醇类似物的N-烷基化对抑制是有害的,除了来自大肠杆菌的β-d-半