NaH-Mediated One-Pot Cyclocondensation of 6-Nitroquinoline with Aromatic Hydrazones To Form [1.2.4]Triazino[6,5-<i>f</i>]quinolines and/or Pyrazolo[3,4-<i>f</i>]quinolines
作者:Takehiko Kawakami、Koji Uehata、Hitomi Suzuki
DOI:10.1021/ol9911167
日期:2000.2.1
[GRAPHICS]8-Nitroquinoline undergoes direct cyclocondensation with aromatic hydrazones in the presence of sodium hydride in DMF at -10 degrees C, giving the corresponding 8 aryl-1(3)H-pyrazolo[3,4-f]quinolines and/or 3-aryl[1.2.4]triazino[6,5-f]quinolines in low to moderate yield, The mode of cyclocondensation is considerably dependent on the electronic nature of ring substituent of hydrazones, an electron donating substituent favoring the formation of the latter heterocycles.