摘要:
3-Bromo-4-nitroquinoline 1-oxide (1) reacted with 2-methylaminoethanol, 1-amino-2-propanol and ethylenediamine to give the corresponding 3-amino-4-nitroquinoline 1-oxides (2, 4 and 7), which readily underwent the intramolecular cyclization, upon heating with Ac2O in DMF, to afford the morpholino[2,3-b]quinolines (3 and 6) and the piperazino[2,3-b]quinoline (8). The reaction of 1 with N,N'-dimethylethylenediamine afforded directly the piperazinoquinoline (10), and that with 2-aminoethanethiol gave the thiomorpholino[2,3-b]quinoline (11) and its 10-oxide (12).