摘要:
Indoxyl-β- -glucuronide. its stable salts and analogs thereof are described, together with a process for the production thereof in which a compound of the formula: where X is halogen and R is lower alkyl is reacted with a compound of the formula: where R 1 is any common carboxyl-protecting group, X, Y, Z and Q are the same or different and selected from hydrogen, halogen, trihalogenated alkene, trihalo-methyl, nitro, saturated or unsaturated alkyl and an aromatic moiety in water and methylene chloride containing an alkali hydroxide in the presence of a phase transfer catalyst, with subsequent removal of the blocking groups and conversion to the desired stable salt.
摘要:
Indoxyl-β- -glucuronide. its stable salts and analogs thereof are described, together with a process for the production thereof in which a compound of the formula: where X is halogen and R is lower alkyl is reacted with a compound of the formula: where R 1 is any common carboxyl-protecting group, X, Y, Z and Q are the same or different and selected from hydrogen, halogen, trihalogenated alkene, trihalo-methyl, nitro, saturated or unsaturated alkyl and an aromatic moiety in water and methylene chloride containing an alkali hydroxide in the presence of a phase transfer catalyst, with subsequent removal of the blocking groups and conversion to the desired stable salt.
摘要:
A process for producing unnatural penicillins and cephalosporin derivatives thereof in which peptide analogs of ACV in which the L-a-aminodipyl moiety is replaced by L-S-carboxymethyl cysteine or other substituents, are reacted with cyclase, epimerase and ring expansion enzyme isolated from a cell free extract of a prokaryotic organism such as S. clavuligerus. The product depends upon the presence or absence of co-factors such as ferrous ion, a-ketoglutarate, and ascorbate. In an alternative embodiment, a penicillin analog having the formula may be reacted with L-cysteine to produce an analog of isopenicillin N which may be reacted with the enzyme reagent to produce the desired penicillin or cephalosporin.
摘要:
A process for producing peptides and β-lactam antibiotics from their amino acid precursors, and analogs thereof, is described. A mixture of L -a-aminoadipic acid (A), L -cysteine (C) and L -valine (V) is enzymatically converted into LLD -ACV by a glycerol stabilized cell free extracted of Cephalosporium acremonium (Acremonium chrysogenum ATCC48272). The cell free extract is a single enzyme defined as ACV-synthetase which requires all three L-amino acids for maximum activity.
摘要:
A peptide precursor of the ACV (aminoadipyl- cysteinylvaline) type, in which the valine moiety may be replaced by any readily available amino acid may be converted into a cephalosporin of the type where R, is H, lower alkyl or functionalized carboxylic group and R 2 is H or lower alkyl, by reacting the precursor with novel cyclase, epimerase and ring expansion enzymes isolated from a cell-free extract of a prokaryotic organism such as Streptomyces clavuligerus. The three novel enzymes may be immobilized separately or together on a suitable support medium and the conversion may be carried out in a continuous mode.
摘要:
A peptide precursor of the ACV (aminoadipyl- cysteinylvaline) type, in which the valine moiety may be replaced by any readily available amino acid may be converted into a cephalosporin of the type where R, is H, lower alkyl or functionalized carboxylic group and R 2 is H or lower alkyl, by reacting the precursor with novel cyclase, epimerase and ring expansion enzymes isolated from a cell-free extract of a prokaryotic organism such as Streptomyces clavuligerus. The three novel enzymes may be immobilized separately or together on a suitable support medium and the conversion may be carried out in a continuous mode.