Abstract:
The present invention relates to an improved process for the preparation of cephalosporin antibiotics of formula (I). The present invention also provides new salts of compound of formula (II) and a process for the preparation of these new salts, where n = 0.5 to 2. The present invention also provides a process for the preparation of compound of formula (I) using the new salts of formula (II).
Abstract:
The present invention more particularly relates to a process for the preparation of cephalosporin antibiotics of the formula (I) wherein R 1 represents hydrogen, trityl, CH 3 , CR a R b COORY c where R a and R b independently represent hydrogen or methyl and R c represents hydrogen or (C 1 -C 6 )alkyl; R 2 is carboxylate ion or COOR d , where R d represents hydrogen, ester or a counter ion which forms a salt; R 3 represents hydrogen, CH 3 , CH 2 OCOCH 3 , CH=CH 2 .
Abstract translation:本发明更具体地涉及一种制备式(I)的头孢菌素抗生素的方法,其中R 1表示氢,三苯甲基,CH 3,CR a R b COOR cc,其中R a和R b独立地表示氢或甲基,R c表示氢或(C 1 -C 6) 烷基; R2是羧酸根离子或COORd,其中Rd表示氢,酯或形成盐的抗衡离子; R3表示氢,CH3,CH2OCOCH3,CH = CH2。
Abstract:
A novel industrial process for preparing 7-[2-(2- amino- thiazol-4-yl)-2-lower-alkoxycarbonylmethoxyiminoacetamido] 3-cephem compounds of the general formula (I) or salts thereof (wherein R is an organic group; R is carboxyl or protected carboxyl; and R is lower alkyl), characterized by reacting a 7-amino-3-cephem compound of the general formula (II), a reactive derivative thereof obtained by modifying the amino group, or a salt thereof with a compound of the general formula (III) or a salt thereof (wherein X is halogeno).
Abstract translation:一种用于制备通式(I)的7- [2-(2-氨基 - 噻唑-4-基)-2-低级 - 烷氧基羰基甲氧基亚氨基乙酰氨基] 3-头孢烯化合物或其盐(其中R 1为 有机基团; R 2是羧基或保护的羧基; R 3是低级烷基),其特征在于使通式(II)的7-氨基-3-头孢烯化合物,其通过 用通式(III)的化合物或其盐(其中X为卤素)改性氨基或其盐。
Abstract:
The present invention provides processes for the production of a compound of formula (IAbstract) wherein X, R1 and R2 are substituents conventional in cephalosporin chemistry; especially a compound of formula (IAbstract) is ceftriaxone, cefotaxime; e.g. in the form of a salt.
Abstract:
A process for preparing β-lactam derivatives of formula (I), wherein R1 represents hydrogen or a metal salt; and R2 represents hydrogen, acetoxy methyl, (2,5-dihydro-2-methyl-6-hydroxy-5-oxo-as-triazin-3-yl)thiomethyl or (1-methyl-1H-tetrazol-5-yl)thiomethyl is disclosed. This process comprises the steps of (a) reacting triphenylphosphine and hexachloroethane or carbon tetrachloride with 2-(2-aminothiazol-4-yl)-2-syn-methoxyimino acetic acid in an organic solvent to give the corresponding acyloxyphosphonium chloride derivative of formula (II), and (b) acylating a previously silylated derivative of 7-ACA with this acyloxyphosphonium chloride derivative without its isolation.
Abstract:
The present invention relates to an improved process for the preparation of cephalosporin antibiotics of formula (I). The present invention also provides new salts of compound of formula (II) and a process for the preparation of these new salts, where n = 0.5 to 2. The present invention also provides a process for the preparation of compound of formula (I) using the new salts of formula (II).
Abstract:
A process for the preparation of cephalosporin antibiotic of the formula (I) wherein R 1 represents hydrogen, trityl, etc,; R 3 is carboxylate ion or COOR d , where R d represents hydrogen, ester or a counter ion which forms a salt; R 4 represents H, OCH 3 , OCOCH 3 , =CH 2 , OCONH 2 , etc, which comprises: (i) condensing the activated derivative of the formula (III) where X represents halogen atom, with 7-amino cephalosporin derivative of the formula (XV) wherein R represents hydrogen, lower alkyl, etc, in the presence of a solvent at a temperature in the range of -50 °C to +50 °C to produce a compound of formula (XVI) ii) maintaining the pH in the range 5.0-10.0 using an inorganic base, iii) cyclizing the compound of formula (XVI) with thiourea to produce compound of formula (I).