Synthesis and anti-bacterial activities of some novel pyrazolobenzothiazine-based chalcones and their pyrimidine derivatives
作者:Mujahid Hussain Bukhari、Hamid Latif Siddiqui、Matloob Ahmad、Tanvir Hussain、Mark G. Moloney
DOI:10.1007/s00044-011-9820-0
日期:2012.10
pyrazolobenzothiazine-based chalcones by refluxing with guanidine hydrochloride. The starting materials 4-(3,4-dimethyl-5,5-dioxidobenzo[4,3-c][1,2]thiazin-2(4-H)yl)phenyl)ethanone (2) or 4-(3,4-dimethyl-5,5-dioxidobenzo[4,3-c][1,2]thiazin-2(4-H)yl)benzaldehyde (3) were obtained by N-arylation of 3,4-dimethyl-2,4-dihydrobenzo[e]pyrazolo[4,3-c][1,2]thiazine 5,5-dioxide (1) with 4-fluoroacetophenone or 4-fluorobenzaldehyde
由吡唑并苯并噻嗪基查耳酮与盐酸胍回流制备了一系列新的十五种嘧啶衍生物。起始原料4-(3,4-二甲基-5,5-二氧化苯并[4,3-c] [1,2]噻嗪-2(4-H)基)苯基)乙酮(2)或4-(3通过3,4-二甲基-2的N-芳基化反应获得了(4-4-二甲基-5,5-二氧化苯并[4,3-c] [1,2]噻嗪-2(4-H)基)苯甲醛(3)。,4-二氢苯并[e]吡唑并[4,3-C] [1,2]噻嗪5,5-二氧化物(1)分别用4-氟苯乙酮或4-氟代苯甲醛,使用相转移催化剂,十六烷基三- ñ丁基丁基溴化phon。所述Ñ -arylated产物(2)或(3)在MeONa / MeOH中与多种芳族醛或酮反应,得到两个系列的新查尔酮4和5。在KOH (aq)和H 2 O 2 / EtOH中用盐酸胍将4或5回流,得到2-(4-(2-氨基-6-芳基嘧啶-4-基)苯基)3,4-二甲基-2, 4-二氢苯并[e]吡唑并[4