Water → 2-butyl-7-methoxycarbonyl-4-(2-propyl)-3-oxo-3,4-dihydro-2H-1,4-benzoxazine

Participants

Reaction Conditions

Reaction Steps

To a solution of 2 -butyl-7-methoxycarbonyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine (9.0 g) in dimethylformamide (180 ml) were added 60% sodium hydride (in oil) (1.63 g) and 2-iodopropane (6.35 g) and the mixture was stirred at 80° C. for 2 hours. Water was added to the reaction solution and extraction with ethyl acetate was conducted. The solvent was distilled off under reduced pressure and the resulting residue was subjected to purification by column chromatography using ethyl acetate/hexane [1:8 (v/v)] to give 2-butyl-7-methoxycarbonyl-4-(2-propyl)-3-oxo-3,4-dihydro-2H-1,4-benzoxazine (2.2 g) as an oil.

Provenance & Evidence