Imidazo(2,1-b)benzothiazoles. II. Synthesis and antiinflammatory activity of some imidazo(2,1-b)benzothiazoles.
作者:Abdel-Nasser EL-SHORBAGI、Shin-ichiro SAKAI、Mahmoud A. EL-GENDY、Nabil OMAR、Hassan H. FARAG
DOI:10.1248/cpb.37.2971
日期:——
novel [2-[p-(un)substituted phenyl]imidazo[2,1-b]benzothiazol-3- yl]formaldehyde derivatives (6a--e). Derivatives 6a--e reacted with ethyl bromoacetate to give ethyl 3-hydroxy-3-[2-[p-(un)substituted phenyl]imidazo[2,1-b]benzothiazol- 3-yl]propionate esters (7a--e). Compound dl-7a was resolved with l-(+)-tartaric acid. Compounds 2a--e showed weak or no activity in the carrageein-induced paw edema assay
通过相应的2- [p-基团]的相互作用制备3- [2- [p-(Un)取代的苯基]咪唑并[2,1-b]苯并噻唑-3-基]丙酸衍生物(2a-e)。在乙酸酐和乙酸存在下,用丙烯酸将(未)取代的苯基]咪唑并[2,1-b]苯并噻唑(1a-e)取代。2a-e的酯化反应生成了甲酯(3a-e)。通过3a与间氯过苯甲酸的相互作用,获得S-二氧化物(4a)。通过碱水解由4a制备化合物5a。1 a-e的Vilsmeier甲酰化反应产生了新的[2- [p-(未)取代的苯基]咪唑基[2,1-b]苯并噻唑-3-基]甲醛衍生物(6a-e)。衍生物6a-e与溴乙酸乙酯反应生成3-羟基-3- [2- [对-(未)取代的苯基]咪唑并[2,1-b]苯并噻唑-3-基]丙酸酯乙酯(7a- e)。用1-(+)-酒石酸拆分化合物dl-7a。化合物2a-e在角叉菜胶诱导的爪水肿测定中显示弱或无活性。在毛细血管通透性抑制试验中,化合物4