Meropenem → Meropenem Trihydrate

Participants

Reaction Conditions

Reaction Steps

20 g of meropenem-PNB was dissolved in 200 mL of tetrahydrofuran. 60 g of potassium phosphate monobasic (KH2PO4) dissolved in 400 mL of water was added thereto and heated to 27° C. 80 g of zinc powder was slowly added portionwise and stirred between 25 and 35° C. for 1 hour. After completion of the reaction, zinc powder was removed by filtration. 220 mL of methylene chloride was added and stirred, and the phases were separated. The aqueous layer was isolated and washed 2 times with 100 mL of methylene chloride, by which tetrahydrofuran present in the aqueous layer was removed completely. After the aqueous layer was cooled, 800 mL of cooled methanol was added dropwise to precipitate potassium phosphate crystal. After the crystal was filtered, the filtrate was passed through a column filled with rinsed cationic resin BCMB50 to remove the remaining phosphate. A buffer solution of N-methylmorpholine/acetic acid (pH 6.5) was added thereto, and concentration was conducted to a volume 10 times greater than the weight of meropenem-PNB. 1100 mL of acetone was added to generate crystal and stirred at room temperature for 1 hour. After filtration and drying, 10.15 g of meropenem trihydrate was obtained.

Provenance & Evidence