Cephalosporin 3′-triphenylphosphorane reacted with α-halogeno ketones to give new tricyclic cephalosporins; their aminothiazole oximino derivatives showed a significant activity against gramnegative bacteria.
K. Sakagami, M. Tashiro, Y. Takeuchil and M. Hatanaka, J. Chem. Soc., Perkin Trans. 1, 1991, 1766 DOI: 10.1039/P19910001766
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