A process for producing crystalline acetoxymethyl ester of (+)-(5R,6S)-6- [(R)-1-hydroxyethyl]-3-(3-pyridyl)-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid by adding a poor solvent to a solution of acetoxymethyl ester of (+)-(5R,6S)-6-[(R)-1-hydroxyethyl]-3-(3-pyridyl)-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid in a good solvent is disclosed. The crystalline penem compound is useful as an antibacterial agent.
揭示了一种通过向良溶剂中的(+)-(5R,6S)-6-[(R)-1-羟乙基]-3-(3-
吡啶基)-7-氧代-4-
硫代-1-
氮杂双环[3.2.0]庚-2-烯-2-
羧酸的乙酰氧甲基酯溶液中添加贫溶剂来生产结晶乙酰氧甲基酯的过程。这种结晶的
青霉素类化合物可用作抗菌剂。