Dicyclohexylcarbodiimide → N-[6-(Acetylamino)pyridin-3-yl]-5-fluoro-1-(3-fluorobenzyl)-1H-indole-2-carboxamide

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Reaction Steps

To a solution, stirred at 20° C. under an inert atmosphere, of 2 g (6.96 mmol) of 5-fluoro-1-[(3-fluorophenyl)methyl]-1H-indole-2-carboxylic acid, prepared according to the protocol described in step 1.1, in 40 mL of DMF are added 1.72 g (8.35 mmol) of dicyclohexylcarbodiimide (DCC) and 1.13 g (8.35 mmol) of 1-hydroxybenzotriazole hydrate (HOBT). The reaction mixture is stirred at room temperature for 30 minutes. 2.1 g (13.92 mmol) of 2-acetamido-5-aminopyridine and 20 mg of dimethylaminopyridine (DMAP) are then added to the reaction mixture. After stirring for 24 hours at 20° C., the reaction mixture is concentrated to dryness. The residue obtained is taken up in a mixture of 200 mL of saturated aqueous NaHCO3 solution and 200 mL of ethyl acetate. The phases are separated by settling and the aqueous phase is extracted with 200 mL of ethyl acetate. The combined organic phases are dried over sodium sulfate and then concentrated under reduced pressure. A solid is collected, and is purified by chromatography on a column of silica, eluting with a mixture of dichloromethane and methanol. 2.6 g of the expected product are thus obtained.

Provenance & Evidence