1
Joanne J Bronson, Stanley V D Andrea, Shelley E Hoeft, John D Matiskella, Peter F Misco Jr, Bing Y Luh, Dane M Springer, Yasutsugu Ueda, John A Wichtowski: Cephalosporin derviatives. Bristol Myers Squibb Company, David M Morse, April 15, 1997: US05620969 (11 worldwide citation)

Novel cephem derivatives represented by the general formula ##STR1## in which the Acyl substituent is a group of the formula ##STR2## wherein Ar is a lipophilic optionally substituted phenyl, naphthyl or pyridyl group; R.sup.1 represents either the residue of a heterocyclic amino acid or a C.sub.2 - ...


2
Process for preparation of cephalosporin derviatives. Lilly Co Eli, August 13, 1980: GB1573026-A

7-Alkoxy-3-chloromethyl-3-cephems are provided by reacting a 3-methylenecepham with an alkali metal salt of a lower primary alcohol in the presence of tert-butyl hypochlorite at a temperature ranging from about -80 DEG to about 0 DEG C. The 3-chloromethylcephems provided by this invention are useful ...



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