摘要:
Amino substituted acylthio cephalosporins of the general formula
wherein R is hydrogen, lower alkyl, aralkyl, tri(lower alkyl)silyl, tri(lower alkyl)stannyl, a salt forming ion or the group
R1 is hydrogen, lower alkyl, aryl or certain heterocyclic groups; R2 and R3 each is hydrogen, lower alkyl or phenyl R4 is lower alkyl, aryl or aralkyl; R5 is hydrogen or lower alkyl; R6 is hydrogen or lower alkyl; or together R5 and R6 complete certain nitrogen heterocyclics; X is hydrogen, hydroxy, azido, lower alkanoyloxy, lower alkoxy, lower alkylthio, lower alkylthiadiazolythio, the radical of a nitrogen base, or together X and R represent a bond linking carbon and oxygen in a lactone ring; and n is 1, 2 or 3; are useful as antibacterial agents.
摘要:
3-(2-(Thioacylthio)alkanamido)-1,4-(cyclo-(1''carboxy)alkylenethio)azetidin-2-one derivatives possessing antibacterial activity are produced by the reaction of a carbodithioic acid 1-carboxy(lower)alkyl ester and a 3-amino-1,4(cyclo(1''-carboxy)alkylenethio)azetidin-2-one derivative in the presence of a condensing agent.
摘要:
7-Cyanomethylmercaptoacetamidocephalosporins, 7cyanomethylsulfinylacetamidocephalosporins, and 7cyanomethylsulfonylacetamidocephalosporins, which have antibacterial activity, are disclosed.
摘要:
Cephalexin is purified by allowing it to precipitate as a sparingly soluble salt with a base such as a nitrogen-containing heterocyclic compound (e.g. quinoline, isoquinoline) or an aniline or naphthylamine compound (e.g. dichloroaniline, Alpha naphthylamine), separating the salt and decomposing the salt.
摘要:
A process for preparing a 7-aminocephalosporin from a 7 Beta acylamidocephalosporin by the imide halide technique in which the 4-carboxyl group of the 7 Beta -acylamido cephalosporin is first protected by reaction with a phosphorus trihalide, particularly phosphorus trichloride.
摘要:
New vinylaminoacetylpenicillins and vinylaminoacetyl cephalosporins have the formula A is the 6-aminopenicillanic acid moiety and certain derivatives thereof or the 7-aminocephalosporanic acid moiety and certain derivatives thereof. R1 is -CN or -COR5. R2 is -CN, -COR5, -SO2R6 or -PO(R7)2. R3 is hydrogen, lower alkyl, phenyl, hydroxyphenyl, thienyl, furyl or pyridyl. R5, R6 and R7 each is lower alkoxy or phenyl. These products are useful as antibacterial agents.
摘要:
WHEREIN Z is hydrogen, lower alkyl or a salt forming ion and R is aryl, substituted aryl, lower alkyl or cycloalkyl. These compounds are useful as antibacterial agents.
This invention relates to new cephalosporin derivatives and methods for preparing the same, said derivatives having the structure
摘要:
7-ACYLAMIDE-3-CEPHEM-4-CARBOXYLIC ACIDS ARE PREPARED IN AN INDUSTRIALLY ADVANTAGEOUS MANNER, BY REACTING A 7-AMINO-3-CEPHAM4-CARBOXYLIC ACID WITH THE REACTIVE DERIVATIVES OF A CARBOXYLIC ACIDS IN THE PRESENCE OF ALCOHOLS, AS A SOLVENT, AND THEREAFTER, IF NECESSARY, REMOVING THE PROTECTING GROUP FOR THE AMINO GROUP OF THE ABOVE-OBTAINED PRODUCTS.
摘要:
WHEREIN R1 is hydrogen, lower alkyl, cycloalkylmethyl, cycloalkenylmethyl, cycloalkadienylmethyl, aryloxymethyl, aralkyl, certain heterocyclic groups and certain substituted members of such groups; R2 is hydrogen, lower alkyl, phenyl or phenyl-lower alkyl and R3 is lower alkyl, lower alkenyl, aryl or aralkyl. X is hydrogen, hydroxy, lower alkanoyloxy, aroyloxy, lower alkoxy, aralkanoyloxy, the radical of a nitrogen base, a quarternary ammonium radical, lower alkylmercapto or certain heterocyclic substituted mercapto groups. They are useful as antibacterial agents.
D R A W I N G New acylthiomethyl esters of cephalosporins have the formula
摘要:
Para-nitrobenzyl 7-amino-3-methyl-3-cephem-4-carboxylate hydrochloride (p-nitrobenzyl 7-aminodesacetoxycephalosporinate hydrochloride), a stable, crystalline compound, useful as an intermediate in the synthesis of cephalexin, and other antibiotics.