Regioselective synthesis, characterization and antimicrobial evaluation of S-glycosides and S,N-diglycosides of 1,2-Dihydro-5-(1H-indol-2-yl)-1,2,4-triazole-3-thione
作者:El Sayed H. El Ashry、El Sayed H. El Tamany、Mohy El Din Abd El Fattah、Ahmed T.A. Boraei、Heba M. Abd El-Nabi
DOI:10.1016/j.ejmech.2013.04.047
日期:2013.8
with 2,3,4,6-tetra-O-acetyl-α-d-glucopyranosyl bromide, 2,3,4,6-tetra-O-acetyl-α-d-galactopyranosyl bromide and 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-α-d-glucopyranosyl chloride was investigated in the presence of Et3N and K2CO3 as acid scavengers. A regioselective S-glycosides were obtained by using Et3N whereas, using K2CO3 gave a mixtures of two hybrids having two glycosidic bonds. The two products
1,2-二氢-5-(1 H-吲哚-2-基)-1,2,4-三唑-3-硫酮与2,3,4,6-四-O-乙酰基-α- d的糖基化吡喃葡萄糖基溴,2,3,4,6-四ø -乙酰基α- d -galactopyranosyl溴化物和2-乙酰胺基-3,4,6-三ø -乙酰基-2-脱氧- α- d吡喃葡萄糖基在作为酸清除剂的Et 3 N和K 2 CO 3存在下研究了氯化物。通过使用Et 3 N而使用K 2 CO 3获得区域选择性的S-糖苷。得到具有两个糖苷键的两个杂种的混合物。分离每种混合物的两种产物,并将其表征为S,N 1-和S,N 2-双(糖基化)衍生物。通过1 H NMR,13 C NMR,2D NMR和质谱阐明了新合成的化合物的结构。筛选化合物的抗菌和抗真菌活性。与参考药物(氯霉素和新霉素)相比,某些化合物具有较强的抑制活性。