An improved method for the preparation of 2-chloro sulfinyl azetidin-4-one of the formula: ##STR1## wherein R is: hydrogen; C.sub.1 -C.sub.3 alkyl; halomethyl; cyanomethyl; phenyl; substituted phenyl; phenoxy, benzyloxy- or substituted benzyl; a group of the formula R.sub.2 --O--wherein R.sub.2 is t-butyl, 2,2,2-trichloroethyl, benzyl or substituted benzyl; a group of the formula R.sub.3 --(O).sub.n --CH.sub.2 wherein R.sub.3 is phenyl or substituted phenyl. The 2-chlorosulfinylazetidin-4-one is prepared by reacting a penicillin sulfoxide ester of the general formula ##STR2## wherein R and R.sub.1 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 scavenging amount of a phosphate or hydrogen phosphate of an alkali metal, alkaline earth metal, ammonium, quaternary ammonium or mixtures thereof. These compounds find application as intermediates in the production of cefaclor which are powerful anti-bacterial compounds.
一种改进的制备2-
氯亚砜基氮杂
环丁酮的方法,其
化学式为:其中R为:氢;C.sub.1 -C.sub.3 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;
化学式R.sub.2 --O--的基团,其中R.sub.2为叔丁基、2,2,2-三
氯乙基、苄基或取代苄基;
化学式R.sub.3 --(O).sub.n --CH.sub.2的基团,其中R.sub.3为苯基或取代苯基。通过将具有通用
化学式的
青霉素亚砜酯与N-
氯卤化试剂在惰性有机溶剂中反应制备2-
氯亚砜基氮杂
环丁酮。反应在碱
金属、碱土
金属、
铵、季
铵盐或其混合物的
磷酸盐或氢
磷酸盐的存在下进行。这些化合物在
头孢克洛的生产中作为中间体,
头孢克洛是一种强效抗菌化合物。