Bis(α-bromo ketones): Versatile Precursors for Novel Bis(<i>s</i>-triazolo[3,4-<i>b</i>][1,3,4]thiadiazines) and Bis(<i>as</i>-triazino[3,4-<i>b</i>][1,3,4]thiadiazines)
作者:Mohamed R. Shaaban、Ahmed H. M. Elwahy
DOI:10.1002/jhet.861
日期:2012.5
synthesis of bis(α‐bromo ketones) 5a‐c and 6b,c was accomplished by the reaction of bis(acetophenones) 3a‐c and 4b,c with N‐bromosuccinimide in the presence of p‐toluenesulfonic acid (p‐TsOH). Treatment of 5a‐c and 6b,c with each of 4‐amino‐3‐mercapto‐1,2,4‐triazoles 9a,b and 4‐amino‐6‐phenyl‐3‐mercapto‐1,2,4‐triazin‐5(4H)‐ones 13 in refluxing ethanol afforded the novel bis(s‐triazolo[3,4‐b][1,3,4]thiadiazines)
双(α-溴代酮)5a-c和6b,c的合成是通过在对甲苯磺酸(p- TsOH)存在下双(苯乙酮)3a-c和4b,c与N-溴代琥珀酰亚胺的反应完成的)。用4-氨基-3-巯基1,2,4-三唑9a,b和4-氨基-6-苯基-3-巯基1,2,4-三嗪分别处理5a-c和6b,c ‐5(4 H)‐13在回流的乙醇中提供了新颖的bis(s– triazolo [3,4‐ b ] [1,3,4]噻二嗪)10a‐d和11a‐c以及bis(as -triazino [3,4- b ] [1,3,4] thiadiazines)14a-c和15,收率很高。化合物11B和11C进行的NaBH 4在甲醇中还原,得到目标1,ω -双4-(6,7-二氢-3-取代-5- ħ -1,2,4-三唑并[3,4- b ] [1,3,4]噻二嗪-6-基)苯氧基}丁烷12a和12b的产率分别为42%和46%。