摘要:
Substituted 1,3-dithietane-2-carboxylic acid derivatives useful as intermediates for the preparation of highly effective penicillin and cephalosporin derivatives and the preparation thereof.
摘要:
Bis-Esters of 1,1-alkanediols with 6-beta(hydroxymethyl)penicillanic acid 1,1-dioxide and 6-betaacylaminopenicillanic acids are useful as antibacterial agents. Intermediates useful for the preparation of these compounds include halomethyl, alkylsulfonyloxymethyl and arylsulfonyloxymethylesters of 6-beta(hydroxymethyl)penicillanic acid 1,1-dioxide and 6-beta-aminopenicillanoyloxymethyl-6-'-beta-(hydroxymethyl)-penicillanate 1,1-dioxide.
摘要:
A METHOD OF PRODUCING THE SODIUM SALT OF 6-(5-METHYL3-PHENYL - 4 - ISOXAZOLECARBOXAMIDO)-PENICILLANIC ACID MONOHYDRATE BY THE ACYLATION OF 6-AMINOPENICILLANIC ACID WITH 5 - METHYL - 3 - PHENYLISOXAZOLE - 4 CARBONYL CHLORIDE IN AQUEOUS ACETONE SOLUTION AND IN THE PRESENCE OF SODIUM BICARBONATE. THE RESULTANT SODIUM SALT OF 6-(5METHYL - 3 - PHENYL - 4 - ISOXAZOLECARBOXAMIDO)-PENICILLANIC ACID IS CONVERTED INTO THE FREE ACID BY ACIDIFYING THE REACTION MIXTURE TO A PH OF 2.5-3, THE ACID THUS OBTAINED IS EXTRACTED WITH BUTYL ACETATE, AND THE SOLUTION OF 6-(5-METHYL - 3 - PHENYL - 4 - ISOXAZOLECARBOXAMIDO)-PENICILLANIC ACID IS TREATED WITH AN EQUIMOLECULAR AMOUNT OF SODIUM HYDROXIDE IN ALCOHOLIC SOLUTION.
摘要:
New derivatives of 1,3-thiazolidin-4-yl carboxylic acid of the general formula I ##STR1## wherein R represents hydrogen, (C.sub.1 -.sub.4)alkyl, aralkyl, phenyl, phenyl substituted by a halogen atom or a methoxy group, formyl, acyl, trimethylsilyl;R' represents hydrogen, a pharmaceutically acceptable inorganic or organic cation, (C.sub.1 -.sub.4)alkyl, 2,2,2-trichloroethyl, acetonyl, benzyl, benzyl substituted by nitro or methoxy, phenyl, nitrophenyl, benzhydryl or trimethylsilyl;R' may also represent a radical capable of providing metabolic activation in vivo selected from acetoxymethyl, pivaloyloxymethyl, phthalidyl, benzoyloxymethyl, 5-indanyl, a group of formula ##STR2## or a group of formula ##STR3## in which R" stands for (C.sub.1 -.sub.4)alkyl, (C.sub.5 -.sub.6)cycloalkyl or aryl; A represents hydrogen, halogen, N.sub.3, OH, NH.sub.2 ; or a quaternary N-atom, particularly ##STR4## (and in this case R' is a negative charge; or a O--CO--NH.sub.2 group; or a group of the formula OR"'; O--COR"', NH--CO--R"' or SR"', where R"' is (C.sub.1 -C.sub.4)alkyl, aryl, substituted aryl or a heterocyclic group which can carry lower alkyls;n may be zero or 1.The compounds possess antibacterial utility against microbial infections in man, animals and plants.
摘要:
Penicillin sulfoxide esters are reacted with an isocyanate to produce the corresponding (substituted)-2-carbamoyloxymethylpenam, the corresponding (substituted)-3-carbamoyloxycepham or the corresponding 3-methylcephem. The 6- or 7-side-chain of these products may be cleaved to give the corresponding 6-amino (penams) or 7-amino (cephams and cephems) compounds, and the latter may be reacylated to produce different 6-acyl-2-carbamoyloxymethyl penams, 7-acyl-3-carbamoyloxy cephams and 7-acyl-3-methylcephems. The substituent groups may be removed from the (substituted)-2-carbamoyloxypenams or the (substituted)-3-carbamoyloxycephams to give the corresponding free 2-carbamoyloxymethylpenams or 3-carbamoyloxycephams, respectively.