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Paper | Regular issue | Vol 81, No. 2, 2010, pp.357-370
Published online, 27th November, 2009
DOI: 10.3987/COM-09-11864
A Concise Synthesis of Fluorine-Containing Benzo[h]quinolines and Benzo[h]quinolones by Selective Pyridine and Pyridinone Rings Formation Reactions of N-Propargyl-2,4-bis(trifluoroacetyl)-1-naphthylamine with Various Active Methylene Compounds

Etsuji Okada,* Dai Shibata, Norikado Tsukushi, Masato Dohura, Norio Ota, Satoru Adachi, and Maurice Médebielle

*Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan


N-Propargyl-2,4-bis(trifluoroacetyl)-1-naphthylamine (3) underwent nitrogen-containing heterocyclic ring-formation reactions with a variety of active methylene compounds in the presence of sodium alkoxides. This annulation reactions with dialkyl malonates were highly dependent on reaction temperature to give selectively the corresponding fluorine-containing benzo[h]quinolines (5) at high temperature and 1H-benzo[h]quinolin-2-ones (7 and 8) at low temperature. Furthermore, changing the electron-withdrawing groups of active methylene compounds led to alternation of the reactive site wherein the reagents attack first and to the formation of the different nitrogen-containing heterocyclic systems, pyridine (9), dihydropyridine (11 and 13) and pyridone (12)