4-Aminotetrahydropyran → 4-(6,6-Dimethyl-4-oxo-3-difluoromethyl-4,5,6,7-tetrahydro-indazol-1-yl)-2-(tetrahydro-pyran-4-ylamino)-benzonitrile

Participants

Reaction Conditions

Reaction Steps

The following reaction was conducted at the 300 mg scale and in duplicate at the 500 mg scale: 4-Aminotetrahydropyran (154 mg, 1.52 mmol, 2.0 eq.) and sodium tert-butoxide (146 mg, 1.52 mmol, 2.0 eq.) were added to a stirred solution/suspension of 2-bromo-4-(6,6-dimethyl-4-oxo-3-difluoromethyl-4,5,6,7-tetrahydro-indazol-1-yl)-benzonitrile (300 mg, 0.76 mmol, 1.0 eq.), palladium (II) acetate (8.5 mg, 0.04 mmol, 0.05 eq.), and 1,1′-bis(diphenylphosphino)ferrocene (42 mg, 0.08 mmol, 0.1 eq.) in toluene (2.25 mL). The reaction vial was capped, and the reaction mixture was heated for 20 min at 120° C. under microwave irradiation. The reaction mixture was diluted with water and ethyl acetate and combined. The layers were separated, and the aqueous layer was extracted with ethyl acetate (3×). The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified on a Biotage system (SiO2, hexanes-ethyl acetate) to afford 4-(6,6-dimethyl-4-oxo-3-difluoromethyl-4,5,6,7-tetrahydro-indazol-1-yl)-2-(tetrahydro-pyran-4-ylamino)-benzonitrile (897 mg, 65% yield) as a tan solid: LC/MS (m/z): [M+H]+ 415.2. Further elution with ethyl acetate afforded the title compound, 4-(6,6-dimethyl-4-oxo-3-difluoromethyl-4,5,6,7-tetrahydro-indazol-1-yl)-2-(tetrahydro-pyran-4-ylamino)-benzamide, (131 mg, 9%) as a yellow solid: LC/MS (m/z): [M+H]+ 433.3.

Provenance & Evidence