Tert-butyl cis-(3-carbamoylcyclohexyl)carbamate → tert-butyl N-[(1R,3S)-3-[[5-fluoro-4-(4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-3-yl)-2-pyridinyl]carbamoyl]cyclohexyl]carbamate

Participants

Reaction Conditions

Reaction Steps

Tetrakis(triphenylphosphine)palladium(0) (0.092 g, 0.08 mmol) was added to 3-(2-chloro-5-fluoropyridin-4-yl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine (0.200 g, 0.79 mmol), tert-butyl ((1R,3S)-3-carbamoylcyclohexyl)carbamate (0.231 g, 0.95 mmol) and 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (0.092 g, 0.16 mmol) and Cesium carbonate (0.777 g, 2.38 mmol) in 1,4-dioxane (5.98 ml). Degassed for 5 mins under nitrogen and the resulting suspension was stirred at 120 °C for 2 hours in the microwave reactor. The reaction mixture was partitioned between water (20ml) and DCM (40ml) and separated using a phase separation cartridge. The organics were absorbed onto silica and purified by flash silica chromatography, elution gradient 0 to 60% EtOAc in heptane. Still impure but telescoped through to next stage without further purification. (136mg).

Provenance & Evidence