Process for preparation of penicillin and cephalosporin imino halides
申请人:Eli Lilly and Company
公开号:US04211702A1
公开(公告)日:1980-07-08
Penicillin and cephalosporin imino halides are prepared by reacting of 6-acylaminopenicillins or 7-acylamino cephalosporins with a novel chlorinating compound derived from a triaryl phosphite and chlorine or bromine. The imino halide products are intermediates in the preparation of antibiotic compounds.
Process for preparation of 7-alkoxy-3-bromomethylcephems
申请人:Eli Lilly and Company
公开号:US04048160A1
公开(公告)日:1977-09-13
7-Alkoxy-3-bromomethyl-3-cephems are provided by reacting a 3-methylenecepham with an alkali metal salt of a lower primary alcohol in the presence of a positive brominating agent at a temperature ranging from about -80.degree. to about 0.degree. C. The 3-bromomethylcephems provided by this invention are useful intermediates for the preparation of known cephalosporin antibiotics.
3-exo-Methylenecephalosporins: structure and thermodynamics by experiment and theory
作者:David D. Wirth、Jack B. Deeter
DOI:10.1021/jo00001a086
日期:1991.1
Method of preparation of 3-methylene cepham compounds
申请人:Korea Advanced Institute of Science and Technology
公开号:US04513134A1
公开(公告)日:1985-04-23
A method for the preparation of 3-methylene cepham compounds which comprises reacting 3-halomethyl butenoate derivatives of thiazolinoazetidinone with an aqueous acid solution in a mixed organic solvent.