发明授权
US3890314A Process for producing 7-acylamino-3-methyl-3-cephem-4-carboxylic acids 失效
生产7-亚氨基-3-甲基-3-甲基-4-羧酸的方法

Process for producing 7-acylamino-3-methyl-3-cephem-4-carboxylic acids
摘要:
A 7-Acylamino-3-methyl-3-cephem-4-carboxylic acid is prepared by first forming a 7-acylamino-3-methyl-3-cephem-4-carboxylic acid ester by heating a 6-acyl-aminopenicillanic acid ester S-oxide in the presence of a catalyst consisting of an acid and a sulfide and then deesterifying the intermediate 7-acylamino-3-methyl-3cephem-4-carboxylic acid ester.
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