Reaction of thiosemicarbazide with n-cyanoguanidine: synthesis of 3,5-diamino-1-thiocarbamoyl-and 3,5-diamino-1-thiazol-2-yl-1,2,4-triazoles
作者:V. M. Chernyshev、A. E. Kosov、E. S. Gladkov、S. V. Shishkina、V. A. Taranushich、S. M. Desenko、O. V. Shishkin
DOI:10.1007/s11172-006-0257-4
日期:2006.2
The reaction of thiosemicarbazide with N-cyanoguanidine in an acidic medium afforded 3,5-diamino-1-thiocarbamoyl-1,2,4-triazole, whose condensation with α-halo ketones gave 3,5-diamino-1-thiazol-2-yl-1,2,4-triazoles 7a–d. The latter were also prepared by the independent synthesis from 2-hydrazinothiazoles and N-cyanoguanidine. Acylation of compounds 7a,d under mild conditions and their condensation
氨基硫脲与N-氰基胍在酸性介质中反应生成3,5-二氨基-1-硫代氨基甲酰基-1,2,4-三唑,其与α-卤代酮缩合生成3,5-二氨基-1-噻唑-2 -yl-1,2,4-三唑 7a–d。后者也由 2-肼基噻唑和 N-氰基胍独立合成制备。化合物 7a、d 在温和条件下的酰化以及它们与醛的缩合发生在 C(3')NH2 基团上。芳酰基衍生物11c的结构由X射线衍射确定。二氨基噻唑基三唑 7a 在沸腾的 Ac2O 中酰化得到 3,5-二乙酰氨基-1-(4-苯基噻唑-2-基)-1,2,4-三唑。亚芳基衍生物14b、c和芳酰基衍生物11c的氢化得到相应的苄氨基三唑15a、b。