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
吡咯啉,制备了新型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,然后与
重氮甲烷反应得到1,2,3-三取代-3-芳基-1,2-亚甲基
吡咯啉盐;加热
吡咯啉盐以实现环扩张到相应的1,3,4-三取代-4-芳基-
1,4,5,6-四氢吡啶盐;中和盐并还原四氢
吡啶以提供1,3,4-三取代-4-芳基
哌啶。所形成的
哌啶化合物可用作药理学制剂和发明中其他
哌啶化合物的中间体。本文提供的化合物特别适用于
镇痛药的麻醉激动剂和麻醉拮抗剂。