申请人:LUPIN LABORATORIES LIMITED
公开号:EP0659742A1
公开(公告)日:1995-06-28
An improved method for the preparation of 2-chloro sulfinyl azetidin-4-one of the general formula:
wherein R is hydrogen; C₁-C₃ alkyl; halomethyl; cyanomethyl; phenyl, substituted phenyl, phenoxy, benzyloxy or substituted benzyl with the substituent group selected from halo, alkyl, alkoxy, protected hydroxy, nitro, cyano and trifluoromethyl; a group of the formula R₂ -- O -- wherein R₂ is t-butyl, 2,2,2- trichloroethyl, benzyl or substituted benzyl; a group of the formula R₃-(O)n-CH₂ wherein R₃ is phenyl or substi-tuted phenyl with the substituent group selected from halo, alkyl, alkoxy, protected hydroxy, nitro, cyano or trifluoromethyl, 2-thienyl, 3-thienyl, 2-furyl, 3-furyl or 1,4-cyclohexadienyl, and n is 0 or 1; or a substituted aryl alkyl group of of formula
wherein R₄ has the same meaning as R₃ defined above and W is a protected hydroxy or protected amino group; and R₁ is a carboxylic acid protecting group selected from the group consisting of C₁-C₄ alkyl, 2,2,2-trihalo alkyl, benzyl, substituted benzyl, like p-nitrobenzyl, phenacyl, halo substituted phenacyl and benzhydryl, is disclosed. Such compound is prepared by reacting a penicillin sulfoxide ester of the general formula
wherein R and R₁ have the meanings defined above with an N-chloro halogenating agent in an inert organic solvent. The reaction is carried out in the presence of an acid scavening amount of a phosphate or hydrogen phosphate of an alkali metal, alkaline earth metal, ammonium, quaternary ammonium or mixtures of any thereof. These compounds find application as an intermediate in the production of cefaclor which are powerful anti-bacterial compounds.
一种制备通式为 2-氯亚磺酰基氮杂环丁烷-4-酮的改进方法:
其中 R 是氢;C₁-C₃ 烷基;卤代甲基;氰甲基;苯基、取代苯基、苯氧基、苄氧基或取代苄基,其取代基团选自卤代、烷基、烷氧基、受保护羟基、硝基、氰基和三氟甲基;式 R₂ -- O -- 的基团,其中 R₂ 是叔丁基、2,2,2-三氯乙基、苄基或取代苄基;式 R₃-(O)n-CH₂的基团,其中 R₃ 是苯基或亚苯基,其取代基团选自卤代、烷基、烷氧基、受保护羟基、硝基、氰基或三氟甲基、2-噻吩基、3-噻吩基、2-呋喃基、3-呋喃基或 1,4-环己二烯基,且 n 是 0 或 1;或式 R₃-(O)n-CH₂ 的取代芳基烷基。
其中,R₄ 与上文定义的 R₃ 意义相同,W 是受保护的羟基或受保护的氨基;R₁ 是羧酸保护基,选自由 C₁-C₄ 烷基、2,2,2-三卤代烷基、苄基、取代的苄基(如对硝基苄基)、苯酰基、卤代苯酰基和苯烃基组成的组。这种化合物的制备方法是将通式为
其中 R 和 R₁ 具有上文定义的含义,与 N-氯卤化剂在惰性有机溶剂中反应。该反应在有一定酸清除量的碱金属、碱土金属、铵、季铵或它们的混合物的磷酸盐或磷酸氢盐存在下进行。这些化合物可用作生产头孢克洛的中间体,头孢克洛是一种强效抗菌化合物。