Novel 1,3,4-trisubstituted-4-arylpiperidines are prepared by alkylating a 2,3-disubstituted-3-arylpyrroline to afford a 1,2,3-trisubstituted-3-aryl-1-pyrrolinium salt, reacting the salt with diazomethane to provide a 1,2,3-trisubstituted-3-aryl-1,2-methylene-pyrrolidinium salt, heating the pyrrolidinium salt to effect a ring expansion to the corresponding 1,3,4-trisubstituted-4-aryl-1,4,5,6-tetrahydropyridinium salt, neutralizing the salt and reducing the tetrahydropyridine to provide a 1,3,4-trisubstituted-4-arylpiperidine. The piperidines so formed are useful as pharmacological agents and as intermediates in the preparation of other piperidines of the invention. The compounds provided herein are especially useful as narcotic agonists analgesics and as narcotic antagonists.
通过烷基化2,3-二取代-3-芳基
吡咯烷制备新型1,3,4-三取代-4-芳基
哌啶。该方法包括制备1,2,3-三取代-3-芳基-1-
吡咯铵盐,将该盐与
重氮甲烷反应得到1,2,3-三取代-3-芳基-1,2-亚甲基
吡咯啉
铵盐,加热
吡咯啉
铵盐使其环扩展至相应的1,3,4-三取代-4-芳基-
1,4,5,6-四氢吡啶铵盐,中和盐并还原四氢
吡啶以得到1,3,4-三取代-4-芳基
哌啶。所得的
哌啶化合物可用作药理学制剂和本发明其它
哌啶的中间体。本文提供的化合物尤其适用于
镇痛药物和镇痛拮抗剂。