Methanesulfonic Acid → HCID 178511751, compound

Participants

Reaction Conditions

Reaction Steps

Tetrahydrofuran (250 cm3), ethyl (1α,5α,6α)-7-(6-benzylidenylamino-3-azabicyclo[3.1.0]hex-3-yl)-1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate (25.05 g, 47 mmol) obtained above, and water (250 cm3) were treated with 97% methanesulfonic acid (13.3 g, 138 mmol) and heated to reflux for 24 h. The resulting solution, which contained trovafloxacin methanesulfonate salt, was cooled to 45° C., treated with activated carbon (2.5 g) for 1 hr and filtered. Treatment of the filtrate with saturated aqueous sodium bicarbonate to pH 8 (see PCT Publication No. WO 97/07800, example 1A) yields the above-titled compound.

Provenance & Evidence