Synthesis, X-ray crystal structure determination and antiinflammatory activity of the regioisomers: 5-phenyl-6-(4-pyridyl)-2,3-dihydroimidazo[2,1-<i>b</i>]thiazole and 6-phenyl-5-(4-pyridyl)-2,3-dihydroimidazo[2,1-<i>b</i>]thiazole. A structural reassignment
作者:Susan C. Shilcrat、David T. Hill、Paul E. Bender、Don E. Griswold、Paul W.、Drake S. Eggleston、Ivan Lantos、Lendon N. Pridgen
DOI:10.1002/jhet.5570280504
日期:1991.8
A regiospecific synthesis of 6-phenyl-5-(4-pyridyl)-2,3-dihydroimidazo[2,1-b]thiazole (2) was accomplished by treatment of 6-phenyl-2,3-dihydroimidazo[2,1-b]thiazole (10) with the reactive complex of pyridine and ethyl chloroformate followed by oxidation with chromium(VI) oxide. Reaction of 4-phenyl-5-(4-pyridyl)imidazole-2-thione (12) with 1,2-dibromoethane in the presence of base also gave 2 together
通过处理6-苯基-2,3-二氢咪唑并[2,1 ] ,完成了6-苯基-5-(4-吡啶基)-2,3-二氢咪唑并[2,1- b ]噻唑(2)的区域特异性合成。- b ]噻唑(10)与该反应性复合吡啶和氯甲酸乙酯的接着用铬(Ⅵ)氧化物的氧化。在碱的存在下,4-苯基-5-(4-吡啶基)咪唑-2-硫酮(12)与1,2-二溴乙烷的反应也给出了2及其区域异构体3。2和3的结构由X射线晶体学证实。口服给药在一小时内花生四烯酸诱导的小鼠耳部炎症试验中的评估显示,对水肿的抑制作用比2(48%)和3(34%)少,对6-(4-氟苯基)的抑制作用类似物1(SK&/ F 86002)(69%),一种已知的抗炎剂。