Synthesis and Reactions of 3-Methylthiazolo[3,2-a]Benzimidazole-2-Carboxylic Acid Hydrazide: Synthesis of Some New Pyrazole, 1,3-Thiazoline, 1,2,4-Triazole and 1,2,4-Triazolo[3,4-b]-1,3,4-Thiadiazine Derivatives Pendant to Thiazolo[3,2-a]Benzimidazole Moi
作者:Hatem A. Abdel-Aziz、Nehal A. Hamdy、Ahmad M. Farag、Issa M. I. Fakhr
DOI:10.1002/jccs.200700222
日期:2007.12
4-thiadiazine derivatives 10a,b and 12a,b, respectively. Treatment of hydrazide 2 with phenyl isothiocyanate in refluxing benzene gave the thiosemicarbazide derivative 16. The latter reaction gave 1,3,4-oxadiazole derivative 17 when benzene was replaced by DMF. Cyclization of the thiosemicarbazide derivative 16 with NaOH resulted in the formation of the l,2,4-triazole-3-thione derivative 18.
3-甲基噻唑并[3,2-a]苯并咪唑-2-甲酸乙酯(1)与水合肼反应得到酰肼2,其与CS 2 /KOH反应得到钾盐3。用l处理3 -aryl-2-bromoethanones 4a,b 分别得到 1,3-噻唑啉衍生物 6a,b,而 3 与水合肼反应得到 1,2,4-triazole-3-thione 衍生物 9。反应 9与 L-aryl-2-bromoethanones 4a,b 和肼酰氯 11a,b 生成 1,2,4-三唑并[3,4-b]-1,3,4-噻二嗪衍生物 10a,b 和 12a,b , 分别。在回流苯中用异硫氰酸苯酯处理酰肼2得到氨基硫脲衍生物16。当苯被DMF取代时,后一反应得到1,3,4-恶二唑衍生物17。