Preparation method and composition of cefradine with original research quality

The invention discloses a preparation method of cefradine with an original research quality on the basis of KR840002043 (B1) and US4235900 (A). The preparation method comprises steps as follows: (1) dihydrophenylglycine chloride hydrochloride is added to a solvent, the mixture is cooled, protected 7-ADCA is added to the mixture, and the mixture is subjected to a condensation reaction after being mixed; (2) water and hydrochloric acid are added after the reaction ends, the mixture is subjected to a hydrolysis reaction, an organic phase layer is left to stand for use, a water layer is subjected to vacuum distillation, and non-distillate is retained; (3) the non-distillate is crystallized and filtered, filtrate is left to stand for use, a filter cake is washed and dried, and cefradine is obtained; (4) the organic phase layer and the filtrate are combined, and cefradine is recycled and extracted. The invention further discloses composition of cefradine with the original research quality. The prepared cefradine and the cefradine composition have the original research quality, the preparation method is simple, the reaction conditions of the whole procedure are relatively mild, the cost of raw materials is low, little pollution is caused, and the prepared cefradine composition has stable and high quality.