摘要:
A process for preparing the 7-(1-H-tetrazol-1-yl) acetamide-3-(2-methyl-1,3,4-thiadiazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid or cefazolin, comprising catalysing the acylation of the amino β-lactam, the 7-amino-3-[5methyl-1,3,4-thiadiazol-2-yl)thiomethyl]-3-cephem-4-carboxylic acid, of the formula with an activated acylating agent derived from acetic acid in the presence of a biocatalyst comprising penicillin amidase, and a product of the formula I obtainable by the foregoing process according to claims.
摘要:
A process for preparing the 7-(1-H-tetrazol-1-yl) acetamide-3-(2-methyl-1,3,4-thiadiazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid or cefazolin, comprising catalysing the acylation of the amino β-lactam, the 7-amino-3-[5methyl-1,3,4-thiadiazol-2-yl)thiomethyl]-3-cephem-4-carboxylic acid, of the formula with an activated acylating agent derived from acetic acid in the presence of a biocatalyst comprising penicillin amidase, and a product of the formula I obtainable by the foregoing process according to claims.
摘要:
An enzymatic process for preparing β-lactams, by coupling the 7-amino group of a cephalosporin nucleus with the carboxylic function of an acetic acid derivative consisting of a residue with π-electrons, a short spacer and a carboxylic function or derivative. The process comprises using a penicillin amidase or α-amino acid esterase as free enzyme or in any suitable immobilised form; applying no or maximum 10 % organic solvent, applying at least 100 mmol/l cephalosporin nucleus as long as it is soluble, otherwise 50 - 100 % of its maximum solubility is charged, applying the free organic acid in a 3 - 5 fold molar ratio or activated as ester or amide in a 1 - 3 fold molar ratio, and adjusting the pH to 5.0 - 8.0 and the temperature to 0 - 40°C.
摘要:
A process for preparing cephalosporanic acid derivatives comprises the steps of enzymatically converting a 3-thiolated cephalosporin C compound of formula (III) into a 3-thiolated-α-ketoadipyl-7-aminocephalosporanic acid derivative of formula (IV), wherein R is a heterocyclic group comprising at least a nitrogen atom. Compounds of formula (IV) are used in the preparation of cephalosporin C antibiotics and derivatives thereof.
摘要:
An enzymatic process for preparing 3-thiolated 7-aminocephalosporanic acid derivatives comprises the steps of enzymatically converting a 3-thiolated cephalosporin C of the formula (I), to form a 3-thiolated-glutaryl-7-ACA of the formula (II) and enzymatically converting a compound of formula (II) to form a 3-thiolated-7-ACA of the formula (III) wherein R is a heterocyclic group comprising at least one nitrogen atom and R1 And R2 are both hydrogen atoms or one of them is a hydrogen atom and the other is an acyl donor.
摘要:
A process for the preparation of cephalosporin acid derivatives comprises the step of enzymatically converting cephalosporin C into 7 cephalosporin acid derivatives in the presence of two biocatalysts, wherein one biocatalyst comprises co-immobilised D-amino acid oxidase and a catalase enzyme, and the other biocatalyst comprises immobilised glutaryl acylase.