摘要:
There is provided cephalosporin derivatives of the formula ##STR1## in which R.sup.1 is carboxy-lower alkyl andR.sup.2 is hydrogen, a cation or (with the oxygen atom) a readily hydrolyzable ether group,as well as readily hydrolyzable esters and salts of these compounds and hydrates of the compounds of formula I and of their esters and salts. Also provided are methods for their manufacture and pharmaceutical preparations containing the compounds of formula I.
摘要:
7-acetamidocephalosporins are disclosed herein which are substituted at position 3 of the cephalosporin nucleus with the group ##STR1## wherein R.sub.2 is selected from the group hydrogen, amino, C.sub.1 to C.sub.6 alkylamino and di-C.sub.1 to C.sub.6 alkylamino and R.sub.3, R.sub.4 and R.sub.5 are the same or different and are selected from the group hydrogen, hydroxy, C.sub.1 to C.sub.6 alkyl, C.sub.1 to C.sub.6 alkoxy, trifluoromethyl, phenyl, substituted phenyl, heterocyclic aryl, and R.sub.3 and R.sub.4 or R.sub.4 and R.sub.5 taken together are the moiety --CH.sub.2 (CH.sub.2).sub.2 CH.sub.2 --.
摘要:
Cephalosporins represented by the formulaX--S--Ywherein X is a deacetoxycephalosporinyl group and Y is a 6-membered heterocyclic group containing 1-3 nitrogens at least one of which is substituted and at least one of which is adjacent to a carbonyl group, said heterocyclic group containing one or more ring substituents and being characterized by being non-aromatic and non enolizable to an aromatic form.
摘要:
In the preferred embodiment of the present invention trimethylsilyl 7-trimethylsilyloxycarbonylaminodecephalosporanate was prepared by bubbling dry carbon dioxide into an anhydrous solution of trimethylsilyl 6-trimethylsilylaminodecephalosporanate and found to be a useful intermediate in the production of cefadroxil and cephalexin by its acylation in anhydrous media with the appropriate 2-phenylglycyl chloride hydrochloride. Other cephalosporins are produced by acylation of 7-trimethylsilyloxycarbonylaminoceph-3-em-4-carboxylic acids or esters having a variety of substituents at the 3-position.
摘要:
Novel cephalosporin compounds, process of preparation thereof, intermediates useful in the preparation of the cephalosporins, pharmaceutical compositions formulated therefrom for administration and combinations of the cephalosporins in pharmaceutical composition form with clavulanic acid. The cephalosporin compounds are characterized by a 5-membered nitrogen-containing ring in the group in the 3-position of the sulphur-containing ring.
摘要:
Novel cephalosporins having various acyl substituents at the 7-position and a sulfamidoethyl substituted tetrazolylthiomethyl group at the 3-position of the cephem nucleus are prepared. These compounds have antibacterial activity.
摘要:
A suspension of substantially pure sodium 7-(D-.alpha.-formyloxy-.alpha.-phenylacetamido)-3-(1-methyl-1H-tetrazol-5-ylthiomethyl)-3-cephem-4-carboxylate in methyl alcohol containing about 2% water on treatment with a methyl alcohol solution of sodium hydroxide is converted to a crystalline suspension of sodium 7-(D-.alpha.-hydroxy-.alpha.-phenylacetamido)-3-(1-methyl-1H-tetrazol-5-ylthiomethyl)-3-cephem-4-carboxylate in yields of about 65 to 70%.