2-Bromo-1-(1<i>H</i>-pyrazol-4-yl)ethanone: Versatile Precursor for Novel Mono- and Bis[pyrazolylthiazoles]
作者:Mostafa E. Salem、Ahmed F. Darweesh、Ahmed E. M. Mekky、Ahmad M. Farag、Ahmed H. M. Elwahy
DOI:10.1002/jhet.2571
日期:2017.1
The synthesis of novel bis(thiazoles) 20a, 20b, 20c and 23a, 23b, 23c is reported. Thus, reaction of 2‐bromo‐1‐(5‐methyl‐1‐phenyl‐1H‐pyrazol‐4‐yl)ethanone (6) with the corresponding thioamide derivatives 7a,7b, in refluxing EtOH in the presence of triethylamine, afforded 4‐pyrazolylthiazoles 8a, 8b in good yields. On the other hand, the novel bis(thiazoles) 20a, 20b, 20c and 23a, 23b, 23c were obtained
报道了新型双(噻唑)20a,20b,20c和23a,23b,23c的合成。因此,在三乙胺存在下,在回流的EtOH中,2-溴-1-(5-甲基-1-苯基-1 H-吡唑-4-基)乙酮(6)与相应的硫酰胺衍生物7a,7b反应,得到了4-吡唑基噻唑8a和8b,收率很高。另一方面,新型双(噻唑)20a,20b,20c和23a,23b,23c由6与相应的苯甲醛硫代半金属咔唑19a,19b,19c,22a,22b,22c在回流的EtOH中的反应获得。通过将相应的双(醛)18a,18b,18c和21a,21b,21c与硫代氨基脲缩合获得化合物19a,19b,19c和22a,22b,22c。