Thiophene-substituted chalcones were cyclised with guanidine in the presence of potassium hydroxide to get 4-substituted-6-thiophenopyrimidines 2a–e which were then refluxed with acetylacetone to obtain pyrimidopyrimidines 3a–e. Compounds 2a–e were also refluxed with ethylacetoacetate to afford pyirmidopyirimidines 4a–e which on refluxing with POCl3 in presence of DMF produced compounds 5a–e. Nucleophilic substitution reactions on 5a-e were carried out with aniline to obtain 6a-e. The structures of the newly synthesised compounds have been confirmed by elemental analysis and spectral studies. Some selected compounds have been screened for antibacterial and analgesic activities.
用
氨基
脲在
氢氧化钾存在下对
噻吩取代的查尔孔进行环化反应,得到4取代-6-
噻吩嘧啶2a–e,然后与乙酰乙酮一起回流生成
嘧啶类化合物3a–e。化合物2a–e也与乙基
乙酰乙酸酯回流反应,获得
嘧啶四聚体4a–e,这些化合物在
DMF存在下与POCl3回流产生化合物5a–e。对5a-e进行亲核取代反应,与
苯胺反应得到6a-e。新合成化合物的结构通过元素分析和光谱研究得到了确认。一些选定的化合物已被筛选用于抗菌和镇痛活性测试。