摘要:
Semi-synthetic derivatives of the BU-2867T antibotics are disclosed. These derivatives are active against experimental mammalian tumors, and may be prepared from enzymatic degradation product(s) of BU-2867T A.
摘要:
Potent antibacterial agents of the formula ##STR1## wherein R is methyl, ethyl or isopropyl, and their pharmaceutically acceptable salts, physiologically hydrolyzable esters and solvates, and processes for their preparation, are described.
摘要:
Certain 7-acylamido-3-(2-carboxyalkyl-2,3-dihydro-s-triazolo[4,3-b]pyridazin-3-on-6-ylthiomethyl)-3-cephem-4-carboxylic acids and their salts and easily hydrolyzed esters of the 4-carboxyl group were synthesized and found to be potent antibacterial agents which exhibited good aqueous solubility. A preferred embodiment was 7-[o-(methylaminomethyl)phenylacetamido]-3-(2-carboxyalkyl-2,3-dihydro-s-triazolo[4,3-b]pyridazin-3-on-6-ylthiomethyl)-3-cephem-4-carboxylic acid.
摘要:
The present invention relates to a matrix for sustained-release preparation comprising an ester formed at a terminal carboxyl group of a straight-chain polyester which essentially consists of an .alpha.-hydroxymonocarboxylic acid. The matrix is stable to light, heat, moisture, coloring etc., and is of low toxicity. The sustained-release preparation produced by using the ester of the present invention offers stable drug release over an extended period of time, ensuring sustained stable effect. Furthermore, the sustained-release preparation does not show excess drug release just after administration.
摘要:
The present invention relates to a matrix for sustained-release preparation comprising an ester formed at a terminal carboxyl group of a straight-chain polyester which essentially consists of an .alpha.-hydroxymonocarboxylic acid. The matrix is stable to light, heat, moisture, coloring etc., and is of low toxicity. The sustained-release preparation produced by using the ester of the present invention offers stable drug release over an extended period of time, ensuring sustained stable effect. Furthermore, the sustained-release preparation does not show excess drug release just after administration.
摘要:
7-[2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-(substituted)-iminoacetamido]-3-[3-(quaternaryammonio)-1-propen-1-yl]-3-cephem-4-carboxylates of the formula ##STR1## in which R.sup.1 and R.sup.2 are defined herein and --.sup..sym. N.tbd.Q is a quaternary ammonio group as defined herein, and salts, solvates, hydrates and esters thereof, are potent antibacterial agents. Processes for their preparation and intermediates in such processes are described.
摘要:
7-[D-.alpha.-(4-Hydroxy-1,5-naphthyridine-3-carboxamido)-.alpha.-phenyl (and thienyl and substituted phenyl) acetamido]-3-(2-, 3- or 4-N,N-dimethylaminomethyl-pyridinium)methyl-3-cephem-4-carboxylates were synthesized and found to have potent antibacterial activity in vitro especially against many strains of Pseudomonas aeruginosa.
摘要:
Certain 7-acylamido-3-(2-carboxyalkyl-2,3-dihydro-s-triazolo[4,3-b]pyridazin-3-on-6-ylthiomethyl)-3-cephem-4-carboxylic acids and their salts and easily hydrolyzed esters of the 4-carboxyl group were synthesized and found to be potent antibacterial agents which exhibited good aqueous solubility. A preferred embodiment was 7-[o-(methylaminomethyl)phenylacetamido]-3-(2-carboxyalkyl-2,3-dihydro-s-triazolo[4,3-b]pyridazin-3-on-6-ylthiomethyl)-3-cephem-4-carboxylic acid.
摘要:
7-[D-.alpha.-(4-hydroxy-1,5-naphthyridine-3-carboxyamido)-.alpha.-phenyl (and p-hydroxyphenyl) acetamido]-3-carbamoyloxymethyl-3-cephem-4-carboxylic acids were synthesized and found to have potent antibacterial activity in vitro especially against many strains of Pseudomonas aeruginosa.
摘要:
A method for an addition reaction with the formation of an additional carbon--carbon bond comprising reacting an .alpha.-halogeno carboxylic acid derivative with an alkene in the presence of a catalyst shown by the general formula (1): ##STR1## wherein R.sub.1 is a lower alkyl group.