Intermediate C-3 1-hydroxyalkyl or 1-hydroxyarylalkyl cephems, prepared by reacting Grignard reagents at low temperature with 3-formyl-2-cephem compounds, are oxidized to the corresponding 7-acylamino-3-acyl-2(or 3)cephem-4-carboxylic acids and esters thereof, which are useful as antibiotics or as intermediates in preparing antibiotic substances.
通过在低温下使用Grignard试剂与3-甲酰基-2-头孢烯化合物反应,制备中间体C-3 1-羟基烷基或1-羟基芳基烷基
头孢菌素,然后将其氧化为相应的7-酰基
氨基-3-酰基-2(或3)头孢烯-4-
羧酸及其酯,这些化合物可用作抗生素或用于制备抗生素物质的中间体。