Studies on the synthesis and analgesic and anti-inflammatory activities of 2-thiazolylamino- and 2-thiazolyloxy-arylacetic acid derivatives.
作者:RYOZO MAEDA、EIICHI OHSUGI、TOSHIHIRO FUJIOKA、KATSUMI HIROSE
DOI:10.1248/cpb.31.3424
日期:——
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)。