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

Participants

Reaction Conditions

Reaction Steps

To a mixture of 4-iodo-1-[2-(tetrahydro-pyran-2-yloxy)-ethyl]-1H-pyrazole (for reference procedure see for example WO 2010/139731, which is incorporated herein by reference; 1.54 g, 4.81 mmol), 5-tert-butyl-2H-pyrazol-3-ylamine (668 mg, 4.81 mmol), copper (I) iodide (45 mg, 0.24 mmol) and K2CO3 (1.39 g, 10.1 mmol) was added a solution of toluene (5 mL), previously degassed by using a stream of argon. (R,R)-(−)—N,N-Dimethyl-1,2-cyclohexanediamine (151 μL, 0.96 mmol) was then added and the reaction mixture was heated at 150° 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 (1.29 g, 81%). LCMS (Method 1): Rt 2.31 min, m/z 334 [MH+].

Provenance & Evidence