2-Ethyl-1-{[3-(4-fluorophenyl)isoxazol-5-yl]methyl}-N,N-bis(4-methoxybenzyl)-6,7-dimethyl-1H-imidazo[4,5-c]pyridin-4-amine → 2-ethyl-1-{[3-(4-fluorophenyl)isoxazol-5-yl]methyl}-6,7-dimethyl-1H-imidazo[4,5-c]pyridin-4-amine

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, a solution of 2-ethyl-1-{[3-(4-fluorophenyl)isoxazol-5-yl]methyl}-N,N-bis(4-methoxybenzyl)-6,7-dimethyl-1H-imidazo[4,5-c]pyridin-4-amine (2.52 g, 4.16 mmol) in trifluoroacetic acid (25 g) was stirred at room temperature for 20 hours. The trifluoroacetic acid was removed under reduced pressure, and the resulting red oil was stirred with aqueous hydrochloric acid (25 mL of 6 N) and ethanol (10 mL) for 30 minutes. The resulting mixture filtered to remove a solid impurity, cooled to 0° C., adjusted to pH 14 with the addition of 50% (w/w) aqueous sodium hydroxide, and stirred at for 30 minutes. A solid was present and was isolated by filtration and purified by sequential trituration with toluene, trituration with diethyl ether, and recrystallization from acetonitrile to provide 0.6488 g of 2-ethyl-1-{[3-(4-fluorophenyl)isoxazol-5-yl]methyl}-6,7-dimethyl-1H-imidazo[4,5-c]pyridin-4-amine as a white flocculant solid, mp 255.0-256.0° C.

Provenance & Evidence