A series of 2-thiazolylamino-, 2-thiazolyloxy- and 2-thiazolylthio-arylacetic acid derivatives was prepared by condensation of thioamides with halo-acetals according to Hantzsch's method, and thioamides having the α-methylarylacetic acid moiety were conveniently obtained from haloaromatic nitro compounds by a combination of known methods. In the model reaction of O-phenyl thiocarbamate (XVIII) with chloro-diethylacetal, isolation of intermediates such as acyclic halo-compound (XIX) and 4-ethoxy-2-phenoxy-2-thiazoline (XX) clarified the reaction path for the formation of 2-phenoxythiazole (XXI). The analgesic and anti-inflammatory effects of the compounds studied were evaluated by using the acetic acid-induced writhing method in mice and the rat carrageenin paw edema method, respectively. 2- [4- (2-Thiazolyloxy) phenyl] propionic acid (XIVa) had the most favorable therapeutic ratio between activity and toxicity (in mice).
根据Hantzsch方法,通过
硫酰胺与卤代
乙缩醛的缩合反应制备了一系列2-
噻唑基
氨基、2-
噻唑基氧和2-
噻唑基
硫代芳基
乙酸衍
生物,而具有α-甲基芳基
乙酸部分的
硫酰胺则通过结合已知方法从卤代芳香
硝基化合物中方便地获得。在O-苯基
硫代
氨基甲酸酯(XVIII)与
氯代二
乙缩醛的模型反应中,分离出无环卤代化合物(XIX)和4-乙氧基-2-苯氧基-2-
噻唑啉(XX)等中间体,阐明了苯氧
噻唑(XXI)的生成反应途径。通过小鼠的
醋酸引起的扭体法和大鼠的角叉菜胶引起的足跖肿胀法,分别评估了所研究化合物的镇痛和抗炎作用。2-[4-(2-
噻唑氧基)苯基]
丙酸(XIVa)在活性与毒性之间具有最佳的治疗比(在小鼠中)。