Cesium carbonate → (S)-4-{2-[1-(4-fluorophenyl)ethylamino]-6-(pyrazin-2-ylamino)pyridin-4-yl}benzamide

Participants

Reaction Conditions

Reaction Steps

150 mg of (S)-4-chloro-N2-[1-(4-fluorophenyl)ethyl]-N6-(pyrazin-2-yl)pyridine-2,6-diamine (Reference Example 2), 108 mg of 4-carbamoylphenylboronic acid, 567 mg of cesium carbonate, 21 mg of 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl and 13 mg of tris(dibenzylideneacetone)dipalladium were added in turn to a degassed mixed solution of 3 ml of 1,4-dioxane and 0.6 ml of water, and the mixture was stirred at 100° C. for 17 hours under argon atmosphere. The reaction solution was diluted with ethyl acetate. The solution was washed in turn with water and brine and then dried over magnesium sulfate. The solvent was distilled off under reduced pressure, and then the obtained residue was purified by silica gel column chromatography to obtain 39 mg of (S)-4-{2-[1-(4-fluorophenyl)ethylamino]-6-(pyrazin-2-ylamino)pyridin-4-yl}benzamide. Furthermore, the obtained compound was subjected to hydrochlorination using a conventional method to obtain 31 mg of the objective compound as orange powder.

Provenance & Evidence