3,4-Bis(bromomethyl)thieno[2,3-<i>b</i>]thiophene: Versatile Precursors for Novel Bis(triazolothiadiazines), Bis(quinoxalines), Bis(dihydrooxadiazoles), and Bis(dihydrothiadiazoles)
作者:Osama M. Sayed、Ahmed E. M. Mekky、Ahmad M. Farag、Ahmed H. M. Elwahy
DOI:10.1002/jhet.2373
日期:2016.7
A synthesis of novel bis(triazolothiadiazines) 11, 12, 13, 14, bis(quinoxalines) 16 and 17, bis(thiadiazoles) 24 and 25, and bis(oxadiazole) 31, which are linked to the thieno[2,3‐b]thiophene core via phenoxymethyl group, was reported. Thus, reaction of the bis(α‐bromoketones) 6 and 7 with the corresponding 4‐amino‐3‐mercapto‐1,2,4‐triazole derivatives 8, 9, 10 in ethanol–DMF mixture in the presence
新颖二的合成(triazolothiadiazines)11,12,13,14,双(喹喔啉)16和17,双(噻二唑)24和25,和双(恶二唑)31,其被连接于噻吩并[2,3-报道了通过苯氧甲基的b ]噻吩核。因此,(在双反应α -bromoketones)6和7与相应的4-氨基-3-巯基-1,2,4-三唑衍生物8,9,10在在三乙胺几滴的作为催化剂存在下回流,得到乙醇-DMF混合物中的新颖双(5,6-二氢小号-三唑并[3,4- b ]噻二嗪)11,12,13,14中60–72%的产量。双(喹喔啉)16和17还通过在哌啶为催化剂的条件下,在回流乙腈中6和7与邻苯二胺15的反应,以高收率合成了唯一的产物。双(醛硫代半脲酮)20和21的环化用乙酸酐制得的双(4,5-二氢-1,3,4-噻二唑基)衍生物24和25的收率很高。通过在回流的乙酸酐中将适当的双(N-苯基reflux)29环化3 h,可以以67%的产率获得双(5-苯基-2