Advancements in synthesis of pharmacologically active imidazolidin‐4‐ones and stereochemistry of their Reactions with some Reagents
作者:Khaled F. Saied、Salwa S. Abdelwahab、Heba E. Hashem、Kamal A. Kandeel
DOI:10.1002/jhet.3871
日期:2020.3
1‐Aryl, 1,3‐diaryl‐ and 5‐(2‐oxo‐2‐arylethyl)‐2‐thioxo‐imidazolidin‐4‐ones 2 were prepared as before, nevertheless, equivalent amounts of potassium hydroxide were added to the reaction conditions. This change, dramatically, reduced the reaction time and highly increased the yield of some derivatives. Treatment of 2 with sulfuric acid converted them into their analogous (E)/(E,Z)‐5‐(2‐oxo‐2‐arylethylidene)
如前所述制备1-芳基,1,3-二芳基和5-(2-氧代-2-芳基乙基)-2-硫代-咪唑啉丁-4-酮2,但是,将等量的氢氧化钾加入到反应中条件。这种变化大大减少了反应时间,并大大提高了某些衍生物的收率。用硫酸处理2将它们转化为类似的(E)/(E,Z)-5-(2-氧代-2-芳基亚乙基)衍生物3。的反应2和/或3与三氧化铬影响其转化成相应的2,4-二酮类4和5分别。治疗2和/或3和溴乙酸乙酯一起影响前者转化为各自的2,4-二酮4,而后者产生后者的各自2-烷硫基衍生物。2b与芳族醛的反应得到螺1 H和2 H吡咯非对映异构体的混合物。红外,EI-MS,1 H和13 C-NMR光谱测量证明了新产品的结构。许多选定的化合物显示出良好的抗菌活性。