Synthesis of thiophenecarboxamides, thieno[3,4- c ]pyridin-4(5 H )-ones and thieno[3,4- d ]pyrimidin-4(3 H )-ones and preliminary evaluation as inhibitors of poly(ADP-ribose)polymerase (PARP)
作者:Anne E. Shinkwin、William J.D. Whish、Michael D. Threadgill
DOI:10.1016/s0968-0896(98)00210-7
日期:1999.2
Treatment of 3-cyanothiophene with potassium nitrate and concentrated sulphuric acid gave 5-nitrothiophene-3-carboxamide. 4-Nitrothiophene-2-carboxamide and 5-nitrothiophene-2-carboxamide were formed similarly from 2-cyanothiophene. Reduction with tin(II) chloride gave the corresponding aminothiophenecarboxamide salts which were isolated via their N-Cbz derivatives. Lithiation of 3,4-dibromothiophene at
聚(ADP-核糖)聚合酶(PARP)抑制剂可抑制受损DNA的修复,从而增强癌症的放射治疗和化学疗法。用硝酸钾和浓硫酸处理3-氰基噻吩,得到5-硝基噻吩-3-甲酰胺。由2-氰基噻吩类似地形成4-硝基噻吩-2-甲酰胺和5-硝基噻吩-2-甲酰胺。用氯化锡(II)还原得到相应的氨基噻吩甲酰胺盐,其通过其N-Cbz衍生物分离。3,4-二溴噻吩在-116℃下锂化并用烷基氯甲酸酯淬灭,得到4-溴噻吩-3-羧酸酯,将其水解为4-溴噻吩-3-羧酸。于特利与戊烷-2,4-二酮和1-苯基丁烷-1,3-二酮的烯醇化物发生Hurtley反应,然后进行酰基裂解,分别产生4-(2-氧丙基)噻吩-3-羧酸和4-苯甲酰基噻吩-3-羧酸。与氨在乙酸中缩合得到6-甲基-和6-苯基硫代[3,4-c]吡啶-4-酮,它们在1-和7-位被选择性硝化或被硝化。将4-乙酰氨基-和4-苯甲酰胺基噻吩-3-羧酸乙酯分别环化成2-甲基-和2-苯基-噻吩并[3