Novel 7-azido-3-cephem compounds are prepared via .alpha.-amino-phosphonoacetate esters. The cephem compounds are intermediates for the preparation of novel and known useful antibiotic cephalosporins.
通过α-
氨基-
磷酸酯酯制备新型7-偶氮基-3-头孢烯化合物。这些头孢烯化合物是制备新型和已知有用的抗生素头霉素的中间体。