Sodium hydride → 4-[(3-Bromophenyl)amino]-7-[3-(1-methylpiperidin-4-yl)propyloxy]-6-nitroquinazoline

Participants

Reaction Conditions

Reaction Steps

To a solution of 1.45 g of 3-(1-methylpiperidin-4-yl)propan-1-ol in 40 ml of tetrahydrofuran are added 360 mg of sodium hydride. The white suspension formed is stirred for 15 minutes at 65° C., cooled and mixed with 1.45 g of 4-[(3-bromophenyl)amino]-7-fluoro-6-nitroquinazoline, whereupon the mixture suddenly turns dark red. The reaction mixture is stirred first for 10 minutes at ambient temperature, then for 45 minutes at 65° C. As the reaction is not yet complete, a further 150 mg of sodium hydride are added and the mixture is stirred for a further 45 minutes at 65° C. The solvent is distilled off using a rotary evaporator and the brown residue is stirred with 50 ml of ice water. The aqueous phase is extracted with methylene chloride. The combined extracts are washed with water, dried over sodium sulfate and concentrated by evaporation. The crude product is purified by chromatography over a silica gel column with methylene chloride/methanol/concentrated ammonia solution (90:10:0.05). Yield: 1.30 g of (65% of theory); Rf value: 0.28 (silica gel, methylene chloride/methanol/concentrated aqueous ammonia solution=90:10:0.1); mass spectrum (ESI+): m/z=500, 502 [M+H]+.

Provenance & Evidence