Water → HCID 54516061, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-{2-[4-((5-fluoro-3-indolyl)methyl)piperidino]ethyl}naphtho[1,8-cd]isothiazole 1,1-dioxide (2.3 g) in dimethylformamide (40 cc) is added in the course of 15 minutes to a 50% strength dispersion of sodium hydride (0.27 g) in liquid paraffin, under a stream of argon, while the temperature is maintained in the region of 20° C. The reaction medium is stirred for 1 hour at a temperature in the vicinity of 20° C. and a solution of methyl iodide (0.4 cc) in dioxane (20 cc) is then added in the course of 15 minutes. Stirring is maintained for 15 hours at a temperature in the vicinity of 20° C. The reaction mixture is taken up with distilled water (25 cc) and the organic phase is extracted with dichloromethane (4×50 cc), then washed with distilled water (25 cc), dried over anhydrous magnesium sulphate, filtered and concentrated to dryness at 40° C. under reduced pressure (20 mm Hg; 2.7 kPa). The residue obtained is purified by flash chromatography on a silica column under a stream of argon at moderate pressure (0.5-1.5 bar) with dichloromethane and then a mixture of ethyl acetate and methanol (97:3 by volume) as eluent. 2-{2-[4-((5-Fluoro-1-methyl-3-indolyl)methyl)piperidino]ethyl} naphtho[1,8-cd]isothiazole 1,1-dioxide (0.8 g) is obtained in the form of a yellow oil, which is converted to an acid oxalate, m.p. 150°-152° C.

Provenance & Evidence