Potassium Phosphate, Tribasic → 1-[(2-Tert-butyl-6-cyclopropylpyrazolo[1,5-a]pyrimidin-3-yl)methyl]-4-propylpyrrolidin-2-one

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Reaction Conditions

Reaction Steps

To a solution of 1-[(6-bromo-2-tertbutylpyrazolo(1,5-a)pyrimidin-3-yl)methyl]-4-propylpyrrolidin-2-one 190 (0.56 mmol, 1 eq, 0.2 g) in 5 ml of DME is added successively palladium-tetrakis-triphenylphosphine (0.019 mmol, 0.03 eq, 22 mg), cyclopropyl-boronic acid (0.727 mmol, 1.1 eq, 62 mg), and K3PO4 (1.98 mmol, 3 eq, 0.42 g) dissolved in 4 ml of water. The mixture is degassed and stirred vigorously at 90° C. for 4 hours. The solvent is removed under reduce pressure, water is added and the resulting mixture is extracted with dichloromethane. The organic phases are combined, washed with brine and dried over MgSO4. Volatiles are removed under reduce pressure. The crude product is purified by chromatography on silicagel (CH2Cl2/MeOH/NH4OH: 99/1/0.1) to afford 58 mg of pure 1-[(2-tert-butyl-6-cyclopropylpyrazolo[1,5-a]pyrimidin-3-yl)methyl]-4-propylpyrrolidin-2-one 192 the compound in pure form.

Provenance & Evidence