Superacidic Cyclization of Activated Anthranilonitriles into 2-Unsubstituted-4-aminoquinolines
作者:Hubert Lavrard、Paolo Larini、Florence Popowycz
DOI:10.1021/acs.orglett.7b01798
日期:2017.8.18
4-Aminoquinolines were prepared in a three-step synthesis starting from substituted anthranilonitriles. The condensation on 1,1,1-trichloro-4-ethoxybut-3-enone proceeded efficiently either neat or in refluxing EtOH. Cyclization in superacidic trifluoromethanesulfonic acid provided unstable intermediate, which upon treatment with NaOEt in ethanol, afforded the expected esters. Theoretical investigations
Synthesis of new quinoline fused heterocycles such as benzo[h]-1,6-naphthyridines and pyrazolo[4,3-c]quinolines
作者:Bhausaheb Kedarnath Ghotekar、Maruti G. Ghagare、Raghunath B. Toche、Madhukar N. Jachak
DOI:10.1007/s00706-009-0236-1
日期:2010.2
6-naphthyridines was successfully achieved by cyclocondensation of ethyl 4-aminoquinoline-3-carboxylates with malononitrile. The pyrazolo[4,3-c]quinolines were synthesized by nucleophilic substitution and subsequent addition reaction of ethyl 4-chloroquinoline-3-carboxylates with different hydrazines. All new compounds were characterized by spectral and analytical methods. Graphical abstract
摘要通过将4-氨基喹啉-3-羧酸乙酯与丙二腈进行环缩合,成功地合成了新型苯并[ h ] -1,6-萘啶。通过亲核取代和随后的4-氯喹啉-3-羧酸乙酯与不同的肼的加成反应合成了吡唑并[4,3- c ]喹啉。所有新化合物都通过光谱和分析方法进行了表征。 图形概要