Hydrogen Bromide → 7-Bromoacetyl-1-ethyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid

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Reaction Conditions

Reaction Steps

To 1.12 g (3.80 mmol) of the 7-acetyl-1-ethyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid in 30 ml of acetic acid was added 0.18 g of potassium bromate and 1.48 ml of 48% hydrobromic acid. The mixture was stirred at 50° C. for 24 hours. The mixture was concentrated to one-half volume and 20 ml of water was added. The solids were filtered to give 1.3 g of the 7-bromoacetyl-1-ethyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, mp 213°-215° C.

Provenance & Evidence