3-Fluoroaniline → HCID 178461355, compound

Participants

Reaction Steps

The methods of Erickson (J. Med. Chem., 1979, 22, 7, 816–823) were used to prepare a mixture of 5-fluoroquinoline-3-carboxylic acid hydrochloride and 7-fluoroquinoline-3-carboxylic acid hydrochloride from m-fluoroaniline. A mixture of these two acids (500 mg, 2.2 mmole) in dichloromethane (25 mL) was treated with a solution of oxalyl chloride in dichloromethane (1.2 mL of 2 M, 2.4 mmol) followed by dimethylformamide (5 drops). The reaction was stirred overnight, filtered (Gelman Acrodisc CR PTFE 0.45 micron) and concentrated to a solid. The solid was dissolved in dichloromethane (25 mL) and then treated with trans-4-methylcyclohexylamine hydrochloride (330 mg, 2.2 mmol) followed by 4-N,N′-dimethylaminopyridine (1.22 g, 10 mmol). The reaction was stirred 1 hour at ambient temperature. Chromatography of the crude reaction mixture through a Biotage silica cartridge (8×4 cm i.d.) using a gradient of hexane to 30% ethyl acetate (in hexane) afforded three fractions. Recrystallization of fraction A from hot heptane afforded 30 mg of N-(trans-4-methylcyclohexyl)-7-fluoroquinoline-3-carboxamide (423):

Provenance & Evidence