Synthesis, Conformational Analysis, and Biological Activity of <i>C</i>-Thioribonucleosides Related to Tiazofurin
作者:Palmarisa Franchetti、Stefano Marchetti、Loredana Cappellacci、Hiremagalur N. Jayaram、Joel Aaron Yalowitz、Barry M. Goldstein、Jean-Louis Barascut、David Dukhan、Jean-Louis Imbach、Mario Grifantini
DOI:10.1021/jm990257b
日期:2000.4.6
hydroxide. A similar C-glycosylation of ethyl thiophene-3-carboxylate with 1,2,3,5-tetra-O-acetyl-4-thio-D-ribofuranose catalyzed by stannic chloride afforded an anomeric mixture of 2- and 5-glycosylated regioisomers. Deacetylation of ethyl 5-(2,3,5-tri-O-acetyl)-beta-D-(4'-thioribofuranosyl)thiophene-3-carboxylate (13beta) with methanolic ammonia and treatment of the ethyl ester with ammonium hydroxide gave
呋喃硫呋喃[5β-D-(4'-硫代呋喃呋喃糖基)呋喃-3-羧酰胺,1]和噻吩硫呋喃[5β-D-(4'-硫代呋喃呋喃糖基)噻吩-3-甲酰胺,2]的合成,两个C-硫代核糖核苷类似物描述了噻唑呋林的衍生物。直接三氟乙酸催化呋喃-3-羧酸乙酯与1-O-乙酰基-2,3,5-三-O-苄基-4-硫代-D-呋喃呋喃糖的C-糖基化反应,得到2-和5-糖基化的区域异构体,作为α和β异头物的混合物。将5-(2,3,5-三-O-苄基)-β-D-(4'-硫代呋喃呋喃糖基)呋喃-3-甲酸乙酯(6beta)脱苄基,然后通过与四氢呋喃反应而转化为相应的酰胺(呋喃硫呋喃)氢氧化铵。噻吩-3-羧酸乙酯与1,2,3的相似C-糖基化 氯化锡催化的5-四-O-乙酰基-4-硫代-D-呋喃呋喃糖得到2-和5-糖基化的区域异构体的异头混合物。用甲醇氨将5-(2,3,5-三-O-乙酰基)-β-D-(4'-硫代呋喃呋喃糖基)噻吩-3-羧酸乙