4-Bromopyridinium chloride → 5-methoxy-2-[1-(4-methoxybenzyl)-1H-indazol-3-yl]-N-(pyridin-4-yl)pyrimidin-4-amine

Participants

Reaction Conditions

Reaction Steps

205 mg of 5-methoxy-2-[1-(4-methoxybenzyl)-1H-indazol-3-yl]pyrimidin-4-amine (1-4-1, 0.568 mmol, 1 eq.), 121.6 mg of 4-bromopyridine hydrochloride (1:1) (0.625 mmol. 1.1 eq.), 136.5 mg of sodium 2-methylpropan-2-olate (1.42 mmol, 2.5 eq.), 106.2 mg of 1′-binaphthalene-2,2′-diylbis(diphenylphosphane) (0.171 mmol, 0.3 eq.) and 52.0 mg of (1E,4E)-1,5-diphenylpenta-1,4-dien-3-one-palladium (3:2) (0.057 mmol, 0.1 eq.) were suspended in 3 ml of dry DMF under nitrogen atmosphere. The reaction mixture was stirred for two days at 100° C. 122 mg of 4-bromopyridine hydrochloride (1:1) (0.625 mmol. 1.1 eq.), 137 mg of sodium 2-methylpropan-2-olate (1.42 mmol, 2.5 eq.), 106 mg of 1′-binaphthalene-2,2′-diylbis(diphenylphosphane) (0.171 mmol, 0.3 eq.) and 52.0 mg of (1E,4E)-1,5-diphenylpenta-1,4-dien-3-one-palladium (3:2) (0.057 mmol, 0.1 eq.) were added and stirred for further 24 hours. The mixture was cooled down to room temperature, diluted with 10 ml dichloromethane and filtered off. The filtrate was concentrated in vacuo. The residue was purified by flash chromatography to yield 126 mg (0.23 mmol, 81%) of the analytically pure target compound.

Provenance & Evidence