Hydrochloric Acid → Ethyl 1,4-dihydro-8-fluoro-6-iodo-1-[2-(tert-butyldimethylsilyloxy)ethyl]-4-oxo-3-quinolinecarboxylate

Participants

Reaction Conditions

Reaction Steps

Ethyl 2-(2,3-difluoro-5-iodobenzoyl)-3-[2-(tert-butyldimethylsilyloxy)ethylamino]acrylate (2.3 g, 4.3 mmol) obtained in Step 3 was dissolved in THF (25 ml), sodium hydride (256 mg, 6.4 mmol) was added under ice-cooling and the mixture was stirred at 0° C. for 1 hr. 1N Hydrochloric acid (6.4 ml, 6.4 mmol) was added to neutralize the reaction mixture. Water was further added and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel chromatography (ethyl acetate:hexane=1:2 to ethyl acetate:hexane=2:1) to give the object product (2.0 g, yield 92%) as a white solid.

Provenance & Evidence