The invention provides
parecoxib sodium which is prepared by controlling an intermediate
impurity and in particular provides a preparation method of a
parecoxib sodium compound as well as the intermediate
impurity and an application of the
parecoxib sodium compound. According to the preparation method provided by the invention, 3-methyl-4,5-diphenyl-4,5-dihydro-
isoxazole-5-
alcohol is used as an isomer
impurity for preparing 5-methyl-3,4-diphenyl-4,5-dihydro-
isoxazole-5-
alcohol as an intermediate of the
parecoxib sodium, the quality of the 3-methyl-4,5-diphenyl-4,5-dihydro-
isoxazole-5-
alcohol is controlled in the preparation of the
parecoxib sodium, specifically, the impurity content is required not to be higher than 0.5 percent, and an important significance is provided for the product quality of the
parecoxib sodium; by obtaining the 3-methyl-4,5-diphenyl-4,5-dihydro-isoxazole-5-alcohol as an isomer impurity of the important 5-methyl-3,4-diphenyl-4,5-dihydro-isoxazole-5-alcohol and further studying 3-methyl-4,5-diphenyl-4,5-dihydro-isoxazole-5-alcohol in the aspects of preparation process, detection process and purification process, important
quality monitoring significance is provided for the process with the 5-methyl-3,4-diphenyl-4,5-dihydro-isoxazole-5-alcohol as an industrial production
raw material.