90467-30-4Relevant articles and documents
Process for the preparation of 3-phosphoniummethyl-3-cephem compounds
-
, (2008/06/13)
The invention relates to a process for the preparation of 3-phosphoniummethyl-3-cephem compounds of the formula: STR1 wherein R3 is aryl, or a salt thereof, which is characterized by reacting one equimolar amount of a 3-hydroxymethyl-3-cephem c
7-Acylamino-3-vinylcephalosporanic acid derivatives and processes for the preparation thereof
-
, (2008/06/13)
The invention relates to novel 7-acylamino-3-vinylcephalosporanic acid derivatives of antimicrobial activity, and to methods of preparation thereof from novel intermediate compounds of the formula: STR1 in which RC is amino or a group of the formula: STR2 wherein R8 is aryl, A12 is lower alkylene having a group of the formula: =N?OR4, wherein R4 is hydrogen, cyclo(lower) alkenyl, lower alkynyl, lower alkenyl, lower alkenyl substituted by carboxy or a protected carboxy group, lower alkyl, or lower alkyl substituted by one or more substituent(s) selected from carboxy, a protected carboxy group, amino, a protected amino group, cyano, phosphono, a protected phosphono group and a heterocyclic group which may have suitable substituent(s), Ra is a protected amino group, Rb is a protected carboxy group, Rc and Rd are combined to form oxo or a protected oxo group, and X1 is halogen, and R2 is carboxy or a protected carboxy group, provided that, when RC is amino, then R2 is carboxy, or a salt thereof.
