4-hydroxy-2-quinolones. 169*. synthesis and bromination of 1-allyl-3-(arylamino-methylene)quinoline-2,4-(1h,3h)-diones
摘要:
Bromination of 1-allyl-substituted 3-(arylaminomethylene)quinoline-2,4-(1H,3H)-diones with one equivalent of molecular bromine in glacial acetic acid and subsequent dilution of the reaction mixture with water is accompanied by halocyclization and hydrolysis to form 2-bromomethyl-5-oxo-1,2 dihydro-5H- oxazolo[3,2-a]quinoline-4-carbaldehyde.