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1-7; 1-4 Embodiment 3. the preparation of gabexate mesylate finished product
(add the methanesulfonic acid of 10eq, adjust the pH value with the sodium hydroxide solution of 16% with mass percentage concentration)Add 400ml of acetone to the reaction flask, start stirring, add 100g of gabexate carbonate, add 250.7g of methanesulfonic acid dropwise at 32°C, and the system is completely dissolved after about 10 minutes after the dropwise addition.Then lower the temperature to below 10°C and stir, the system begins to precipitate solids, and after the crystallization is complete, filter to obtain the crude product.Add the crude product and acetone to the reaction flask, raise the temperature to dissolve the crude product, add activated carbon and reflux for 10 minutes, filter to remove the activated carbon, adjust the pH of the filtrate to 5.6 with 16% sodium hydroxide solution by mass percent, then cool down to crystallize, and filter with suction , and the filter cake was dried in a decompression drying oven to obtain 84.7 g of a white crystalline powder product with a yield of 77.8%.The measured pH is 5.3, the main peak content of related substances is 99.957%, and the maximum simple impurity is 0.043%.