Potassium Carbonate → 3-tert-Butyl-1'-[3-(tetrahydro-pyran-2-yloxy)-propyl]-1'H-[1,4']bipyrazolyl-5-ylamine

Participants

Reaction Conditions

Reaction Steps

To a mixture of intermediate 113a (1.50 g, 4.46 mmol), 5-tert-butyl-2H-pyrazol-3-ylamine (620 mg, 4.46 mmol), copper (I) iodide (42 mg, 0.22 mmol) and K2CO3 (1.29 g, 9.37 mmol) was added a solution of toluene (4.6 mL), previously degassed by using a stream of argon. (R,R)-(−)-N,N′-Dimethyl-1,2-cyclohexanediamine (141 μL, 0.89 mmol) was then added and the reaction mixture was heated at 140° C. for 2.5 h under microwave irradiation. The crude reaction mixture was poured into water and extracted with EtOAc (×3). The combined organic layers were washed with brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by FCC on silica, using a gradient of 0-100% EtOAc in cyclohexane, to give the title compound (1.14 g, 73%). LCMS (Method 4): Rt 2.34 min, m/z 348 [MH+].

Provenance & Evidence