申请人:Thiruvengadam K. Tiruvettipuram
公开号:US20060135755A1
公开(公告)日:2006-06-22
A process is provided for preparing azetidinones useful as intermediates in the synthesis of penems and as hypocholesterolemic agents, comprising reacting a β-(substituted-amino)amide, a β-(substituted-amino)acid ester, or a β-(substituted-amino)thiolcarbonic acid ester with a silylating agent and a cyclizing agent selected from the group consisting of alkali metal carboxylates, quaternary ammonium carboxylates, quaternary ammonium hydroxides, quaternary ammonium alkoxides, quaternary ammonium aryloxides and hydrates thereof, or the reaction product of: (i) at least one quaternary ammonium halide and at least one alkali metal carboxylate; or (ii) at least one quaternary ammonium chloride, quaternary ammonium bromide, or quaternary ammonium iodide and at least one alkali metal fluoride, wherein a quaternary ammonium moiety of the cyclizing agent is unsubstituted or substituted by one to four groups independently selected from the group consisting of alkyl, arylalkyl and arylalkyl-alkyl.
提供了一种用于制备可作为青霉烯合成中间体和降胆固醇药物的氮杂环丙烷的方法,包括将β-(取代-氨基)酰胺、β-(取代-氨基)酸酯或β-(取代-氨基)硫代碳酸酯与硅化剂以及选自以下组的环化剂反应:碱金属羧酸酯、季铵羧酸酯、季铵氢氧化物、季铵醇盐、季铵芳基氧化物及其水合物,或以下反应产物的反应:(i)至少一种季铵卤化物和至少一种碱金属羧酸酯;或(ii)至少一种季铵氯化物、季铵溴化物或季铵碘化物和至少一种碱金属氟化物,其中环化剂的季铵部分未取代或由1至4个独立选自以下组的基团取代:烷基、芳烷基和芳烷基-烷基。