Abstract:
Described are compounds having the formula: H1-Y-H2 where H1 is a substrate capable of selectively binding to a first receptor; where H2 is a substrate capable of selectively binding to and selectively forming a covalent bond with a second receptor; and wherein Y is a molety providing a covalent linkage between H1 and H2, which may be present or absent, and when absent, H1 is covalently linked to H2. Also described are uses of the compounds for in vivo screening of compounds are proteins.
Abstract:
The present invention provides novel thioester derivatives of thiazolyl acetic acid of the general formula (I), also, the invention provides a method for preparation of the thioester derivatives and reaction of the thioester derivatives with cephem carboxylic acids to produce cephalosporin antibiotic compounds having general formula (II).
Abstract:
Cefuroxime in the form of a salt with n-butylamine; and its use for the production of cefuroxime axetil or for the production of the sodium salt of cefuroxime.
Abstract:
Highly crystalline, highly filterable sodium Cefoperazone in the form of needle crystal aggregates, obtainable by a process comprising the controlled addition of acetone to a solution of water/acetone/alcohols/sodium Cefoperazone at 20 SIMILAR 40 DEG C.
Abstract:
Process for the preparation of a beta -lactam antibiotic by acylation of a beta -lactam nucleus with the aid of an acylating agent, use being made of a complexing agent, and the acylating agent containing L-isomer and an aldehyde being added during the preparation. This process makes it possible to use a racemic mixture as acylating agent in the preparation of a beta -lactam antibiotic.
Abstract:
A method for preparing crystalline cefadroxil hemihydrate from cefadroxil dimethyl formamide solvate using a mixture of a lower alkanol and water.
Abstract:
A process for producing a carboxylic acid derivative characterized by mixing a quaternary ammonium salt having a specific triazine ring in the molecule, a carboxylic acid compound, and a compound having a nucleophilic functional group to conduct the condensation reaction of the carboxylic acid compound with the compound having a nucleophilic functional group; and a condensing agent comprising the quaternary ammonium salt. By the process, the condensation reaction can be conducted under mild conditions and a carboxylic acid derivative, especially an amide or ester compound, can be obtained in high yield.
Abstract:
Cephem derivatives represented by general formula (I) and pharmaceutically acceptable salts thereof wherein (a) is a benzene ring, a pyridine ring, a pyrazine ring or a five-membered aromatic heterocycle (containing one oxygen or sulfur atom as the cycle-constituting atom); X and Y are each hydrogen, or alternatively CXY is C=N-OH; R1 is phenyl, thienyl or thiazolyl (which may be substituted with amino or halogeno); and R2, R3 and R4 are each hydrogen, halogeno, hydroxy C1-C6 alkyl, isothiuronium C1-C6 alkyl, amino C1-C6 alkyl or amino C1-C6 alkyl thio methyl, with the proviso that when (a) is a five-membered aromatic hetercycle, R4 is absent.
Abstract:
A process to prepare a crystalline beta -lactam compound by the addition of a base to an acidic solution of a beta -lactam compound obtained by the addition of an acid to a solution or suspension of a beta -lactam compound obtained by (a) an acylation reaction of 6-amino-penicillanic acid, 7-amino-cephalosporanic acid, 7-amino-3'-desacetoxycephalosporanic acid or 3-chloro-7-aminodesacetoxydesmethylcephalosporanic acid or derivatives thereof with a mixed-anhydride of the Dane salt of any one of the compound comprising D-phenyl-glycine, D-p-hydroxyphenyl-glycine, D-2(1,4-cyclohexadien-1-yl)glycine or (2-aminothiazol-4-yl)-(2-methoxy-imino-acetic acid) in one or more organic solvents, or (b) dissolving or suspending a crude beta -lactam compound in a solution comprising water and/or one or more organic solvents, wherein, to the solution or suspension of a beta -lactam compound, urea or derivatives thereof and/or amide or derivatives thereof are added.