Heterocyclic compounds with bridgehead nitrogen atoms. Part 7. The synthesis of pyrrolo[2,1,5-cd]indolizines ([2,2,3]cyclazines) and pyrazino[2,1,6-cd]pyrrolizines (6-aza[2,2,3]cyclazines) from 3H-pyrrolizine
作者:Michael A. Jessep、Derek Leaver
DOI:10.1039/p19800001319
日期:——
but-2-yne-1,4-dioate to give dimethyl pyrrolo[2,1,5-cd]indolizine-5,6-dicarboxylate. The salt (8) reacts with nitromethane, in the presence of base, to give 6-nitropyrrolo[2,1,5-cd]indolizine (9a) and with ammonia to give pyrazino[2,1,6-cd]pyrrolizine (10a). Electrophilic substitution reactions of (9a) and (10a), and a nucleophilic substitution of (10a), are described.
3层ħ -Pyrrolizine发生反应以NN二甲基甲酰胺和磷酰氯,得到3-(NN -dimethylaminomethylene)-3- ħ,5 ħ -pyrrolizinium盐(2),分离为高氯酸盐,其可以被进一步转化,以NN -dimethyithioformamide和乙酸酐,变成3,5-双-(NN-二甲基氨基亚甲基)-3 H,5 H-吡咯啉高氯酸盐(8)。盐(2)的共轭碱与丁-2-炔-1,4-二酸二甲酯反应,得到吡咯并[2,1,5-cd]吲哚嗪-5,6-二羧酸二甲酯。盐(8)在碱的存在下与硝基甲烷反应,生成6-硝基吡咯并[2,1,5- cd]吲哚嗪(9a)并与氨水反应生成吡嗪并[2,1,6- cd ]吡咯嗪(10a)。描述了(9a)和(10a)的亲电取代反应以及(10a)的亲核取代。