Studies on the synthesis and anti-inflammatory activity of 2,6-di-tert-butylphenols with a heterocyclic group at the 4-position. II.
作者:YASUO ISOMURA、NORIKI ITO、SHUICHI SAKAMOTO、HIROSHIGE HOMMA、TETSUSHI ABE、KAZUO KUBO
DOI:10.1248/cpb.31.3179
日期:——
2, 6-Di-tert-butylphenols with an imidazo [2, 1-b] thiazole or 2, 3-dihydroimidazo [2, 1-b] thiazole group at the 4-position were prepared. Substituents were introduced at the 5-position of 6-(3, 5-ditert-butyl-4-hydroxyphenyl)-2, 3-dihydroimidazo [2, 1-b] thiazole (Ia) by means of the Vilsmeier reaction and Mannich reaction. 6-(3, 5-Di-tert-butyl-4-hydroxyphenyl)-2, 3-dihydroimidazo [2, 1-b] thiazole 1-oxide (IVa) and the 1, 1-dioxide (IVb) were obtained by oxidation of Ia. The above compounds were examined for anti-inflammatory activity in adjuvant-induced arthritis in rats, and some compounds were further tested for activity in the carrageenin-induced rat paw edema assay and in the AcOH-induced writhing assay in mice. Some of the compounds showed potent anti-inflammatory and analgesic activities. The most potent compound, IVa (25 mg/kg, p. o.), had about the same anti-inflammatory activity as indomethacin (2 mg/kg, p. o.), but IVa (50 mg/kg, p. o.) had weaker analgesic activity than aminopyrine (50 mg/kg, p. o.).
制备了在 4 位上带有咪唑 [2, 1-b] 噻唑或 2, 3-二氢咪唑 [2, 1-b] 噻唑基团的 2, 6-二叔丁基苯酚。通过维尔斯梅尔反应和曼尼希反应,在 6-(3,5-二叔丁基-4-羟基苯基)-2,3-二氢咪唑并[2,1-b]噻唑(Ia)的 5 位上引入了取代基。通过 Ia 的氧化反应得到了 6-(3,5-二叔丁基-4-羟基苯基)-2,3-二氢咪唑并[2,1-b]噻唑 1-氧化物(IVA)和 1,1-二氧化物(IVB)。对上述化合物在佐剂诱导的大鼠关节炎中的抗炎活性进行了检测,并进一步检测了一些化合物在角叉菜胶诱导的大鼠爪水肿试验和 AcOH 诱导的小鼠蠕动试验中的活性。其中一些化合物显示出了强大的抗炎和镇痛活性。抗炎活性最强的化合物 IVa(25 毫克/千克,口服)与吲哚美辛(2 毫克/千克,口服)的抗炎活性大致相同,但 IVa(50 毫克/千克,口服)的镇痛活性弱于氨基比林(50 毫克/千克,口服)。