4-Bromopyridinium chloride → 2-[1-[(4-ethoxy-2,6-difluorophenyl)methyl]-5,6-dihydro-4H-cyclopenta[c]pyrazol-3-yl]-5-methoxy-N-pyridin-4-ylpyrimidin-4-amine

Participants

Reaction Conditions

Reaction Steps

1.74 g of 2-[1-(4-ethoxy-2,6-difluorobenzyl)-1,4,5,6-tetrahydrocyclopenta[c]-pyrazol-3-yl]-5-methoxypyrimidin-4-amine 1-4-1 (4.34 mmol, 1.00 eq.), 1.26 g of 4-bromopyridine hydrochloride (1:1) (6.50 mmol, 1.50 eq.), 540 mg of (R)-(+)-2,2′-Bis(diphenylphosphino)-1,1′-binaphtyl (0.867 mmol, 0.20 eq.), 1.66 g of sodium-tert-buylat (17.3 mmol, 4.00 eq.) and 198 mg of tris(dibenzylideneacetone)dipalladium(0) (0.867 mmol, 0.20 eq.) were suspended in 23 mL of dry DMF and stirred under nitrogen atmosphere at 100° C. bath temperature for 24 h. The reaction mixture was partitioned between half saturated aqueous ammonium chloride solution and DCM/isopropanol (4:1). The separated aqueous layer was extracted twice with DCM/isopropanol (4:1). The combined organic layers were washed with brine, dried over sodium sulfate and concentrated in vacuo. Toluene was added and concentrated in vacuo. The residue was purified by flash chromatography (hexane (50-100%)/ethyl acetate and ethyl acetate (0-100%)/methanole): 655 mg (1.29 mmol, 30%) of analytically pure target compound.

Provenance & Evidence