摘要:
Provided herein is a method for the synthesis of cephalosporin antibiotic compounds comprising the conversion of a protected 7-amino group into a 7-carboxamide moiety in a single step.
摘要:
The novel intermediate compound crystalline 7-[2-(2-fomylaminothiazol-4-yl)-2 -(Z)-(methoxyimino)acetamido]-3-methoxymethyl-3-cephem-4-carboxylic acid-1 -(isopropoxy/crystallization of cefpodoxime proxetil. The crystallization process comprises dissolving or suspending the intermediate in the presence of a nitrile or a ketone or mixtures thereof; at a ratio of 1 gm of the intermediate to 2-15 ml nitrile; or at a ratio of 1 gm of the intermediate to 3-15 ml ketone; in the presence of 5-80 ml water; and thereafter isolating the intermediate in crystalline form and converting the intermediate by splitting off the formyl group from the amino group attached to the thiazolyl group, to obtain the desired product cefpodoxime proxetil, in the form of a diastereoisomeric mixture in a ratio of B/(A+B) of 0.5 to 0.6.
摘要:
The present invention relates to an improved and cost effective process for the industrial preparation of cefpodoxime acid of Formula (I) and a pharmaceutically acceptable ester thereof.
摘要:
The invention relates to a new process for the depletion of 7-amino-3-[(E)-1-propen-1-yl]-3-cephem-4-carboxylic acid in mixtures of 7-amino-3-[(Z)-1-propen-1-yl]-3-cephem-4-carboxylic acid and 7-amino-3-[(E)-1-propen-1-yl]-3-cephem-4-carboxylic acid, by means of the crystalline hydrochloride or a metal or amine salt of 7-amino-3-[(Z/E)-1-propen-1-yl]-3-cephem-4-carboxylic acid or by adsorption chromatography.
摘要:
Compounds of formula (I) ##STR1## wherein R.sup.1 is hydrogen, lower alkyl, aralkyl, cycloalkyl, R.sup.3 CO-- or --C(R.sup.4 R.sup.5)CO.sub.2 R.sup.6 ; where R.sup.4 and R.sup.5 are each independently hydrogen or lower alkyl, or R.sup.4 and R.sup.5 taken together with the carbon atom to which they are attached form a cycloalkyl group; R.sup.3 is hydrogen or lower alkyl and R.sup.6 is hydrogen, lower alkyl, lower alkenyl or a carboxylic acid protecting group;R.sup.2 is isobutyl, 2,2-dimethyl-propyl or cyclohexyl-methyl;n is 0, 1 or 2;X is CH or N;as well as readily hydrolyzable esters thereof, pharmaceutically acceptable salts of said compounds and hydrates of the compounds of formula I and of their esters and salts are disclosed. These compounds have valuable antibacterial activity.
摘要:
The invention relates to a new economical and simple process, using a new intermediate compound, for the production of 3'-substituted 7-amino-3-propenyl-4-cephem-carboxylic acid derivatives of formula ##STR1## wherein R is hydrogen, a negative charge or a silyl protecting group, R.sub.o is hydrogen or methoxy, R.sub.1 is hydrogen or a silyl protecting group and X is the radical of a nucleophile, and their acid addition salts.
摘要:
Described is a protected aminothiazolylacetic acid derivative represented by the following formula (I): ##STR1## wherein A represents a nitrogen atom or a methine group, R.sup.1 and R.sup.2 may be the same or different and individually represent a hydrogen atom, a lower alkyl group or a substituted or unsubstituted aryl group, R.sup.3 represents a lower alkoxy group, a halogenated lower alkoxy group, a triphenylmethoxy group, a lower alkyl group or an acyloxy group, and R.sup.4 represents a halogen atom, a hydroxy group, a lower alkoxy group or a substituted or unsubstituted amino group; and salts thereof; as well as processes for the preparation thereof. The protected aminothaizolylacetic acid derivative according to the present invention is an useful intermediate for introducing a 2-(2-aminothiazol-4-yl)-2-alkoxyiminoacetyl group or a 2-(2-aminotiazol-4-yl)-2-alkenoyl group into a cephem skeleton.
摘要:
The invention relates to a process for the preparation of cephem prodrug esters of the formula: ##STR1## in which R.sup.1 is C.sub.1 -C.sub.5 -alkanoyloxy-C.sub.1 -C.sub.3 -alkyl or C.sub.1 -C.sub.5 -alkoxycarbonyloxy-C.sub.1 -C.sub.3 -alkyl and X is an inorganic or organic anion, and in which the hydroxyimino group is present in the syn-form.
摘要:
The invention relates to a process for the preparation of a compound of the formula I or salts thereof ##STR1## wherein R.sub.1 is hydrogen or trityl,R.sub.2 is hydrogen, trityl, .dbd.NOCH.sub.3, .dbd.NOCH.sub.2 COOH, or .dbd.NOCCOOH(CH.sub.3).sub.2R.sub.3 is hydrogen, --CH.dbd.CH.sub.2, --CH.sub.2 COCH.sub.3, ##STR2## comprising (a) reacting a compound of the formula II ##STR3## wherein R.sub.1 and R.sub.2 are as defined above with a compound of the formula III ##STR4## wherein R.sub.3 is as defined above in the presence of a solvent; (b) refluxing the mixture in the presence of a base; and, (c) if required the compounds of the formula I so obtained are converted into salts thereof. The compounds of the formula I have antibacterial activity.