Studies on nucleoside analogs. XXI. A convenient synthesis of 1,2,4-triazole-5-thione glycosides.
作者:HARUO OGURA、HIROSHI TAKAHASHI、OSAMU SATO
DOI:10.1248/cpb.29.2188
日期:——
The reaction of glycosyl isothiocyanates (1a-c) with acyl or aroyl hydrazine, followed by treatment with Ac2O-H3PO4, afforded 1, 2, 4-triazole-5-thione glycosides (20a, 21a-c, 22a) in fair yields. Attempts to prepare 1, 2, 4-triazole glycoside analogs with acetic anhydride or sodium methoxide failed. The reaction of glycosyl-2-(phenyl-or pyrid-2-ylhydrazine) thiocarboxamides (6a, 7a) with phosgene in pyridine or triethylamine gave thiadiazole-5-thiones (8a, 9a) instead of 1, 2, 4-triazole glycosides.
糖基异硫氰酸酯 (1a-c) 与酰基或芳酰肼反应,然后用 Ac2O-H3PO4 处理,以良好的收率得到 1,2,4-三唑-5-硫酮糖苷 (20a, 21a-c, 22a)。用乙酸酐或甲醇钠制备1,2,4-三唑糖苷类似物的尝试失败了。糖基-2-(苯基-或吡啶-2-基肼)硫代甲酰胺(6a, 7a)与光气在吡啶或三乙胺中反应生成噻二唑-5-硫酮(8a, 9a)而不是1,2,4-三唑糖苷。