Synthesis and Reactions of New Fused Heterocycles Derived from 5-Substituted-4-Amino-3-Mercapto-(4H)-1,2,4-Triazole with Biological Interest
作者:A. Y. Hassan
DOI:10.1080/10426500802470769
日期:2009.10.30
In addition, thenoyl isothiocyanate, thenoyl chloride, 2-thiophenecarbaldehyde, and p-chlorophenyl isocyanate reacted with compound 1 a to afford 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole ring system 10 , 11 , and urea derivative 12 . 1,2,4-Triazolo[3,4-b]-5H-pyrazole derivatives 14 j,k were prepared through the reaction of compound 1 a with 3-chloro-2,4-pentandione and ethyl-2-chloroacetoacetate. Compound
硫代碳酰肼与羧酸在熔融温度下的反应允许改进 5-取代-4-氨基-3-巯基 1,2,4-三唑 1a-g 的制备。化合物1a与2-溴丙酸反应得到酸衍生物2。后者与乙酸酐和三乙胺的混合物反应以提供介离子化合物3。化合物 3 在乙醇中加热得到酯衍生物 4,在甲醇中碱性水解得到酮衍生物 5。取代的 1,2,4-三唑并 [3,4-b]-6H-1,3,4-噻二嗪 6 h,i 和 7 是通过 1 a 与乙酰丙酮、乙酰乙酸乙酯和氯乙酰胺反应合成的。杂环系统8和9是通过1a与2,3-二氯-1,4-萘醌和2,3-二氯喹喔啉的反应制备的。此外,异硫氰酸苯甲酰、苯甲酰氯、2-噻吩甲醛和对氯苯基异氰酸酯与化合物1a反应得到1,2,4-三唑并[3,4-b]-1,3,4-噻二唑环系10、11和脲衍生物12。1,2,4-三唑并[3,4-b]-5H-吡唑衍生物14 j,k 通过化合物1a与3-氯-2,4-戊二酮和2-氯乙酰乙