Felbinac → HCID 10269797, compound

Participants

Reaction Steps

To the polymeric nitrophenol (1.5 g, approx. 1 mmol) was added a filtered solution of 4-biphenylylacetic acid (1.10 g, 5.18 mmol) in a mixture of 1,2-dichloropropane (18 ml) and DMF (2 ml), followed by the addition of a solution of DIC (0.63 g, 4.99 mmol) in 1,2-dichloropropane (5 ml). The mixture was shaken at room temperature for 15 hours, filtered, and the polymer was extensively washed with DCM, DMF, and 1,2-dichloropropane. To the polymer was added 1,2-dichloropropane (5 ml) and a solution of 1-methyl-4-methylaminopiperidine (0.10 g, 0.78 mmol) in 1,2-dichloropropane (10 ml). The resulting mixture was shaken at room temperature for 21 hours and then at 60° C. for one hour, filtered, and the polymer was carefully washed with DCM and methanol. The combined filtrates were concentrated to yield the crude product, which was purified by column chromatography (silicagel, gradient elution with DCM/methanol). The amine was mixed with ethanol and 1 molar aqueous hydrochloric acid, concentrated, and the residual hydrochloride was recrystallized from acetone. 120 mg (42%) of the title compound was obtained.

Provenance & Evidence