Sodium hydride → (S)-tetrahydrofuran-3-yl 4-(3-bromopyrazolo[1,5-a]pyrimidin-5-yl)piperazine-1-carboxylate

Participants

Reaction Steps

To 224 mg (0.50 mmol) of 4-nitrophenyl 4-(3-bromopyrazolo[1,5-a]pyrimidin-5-yl)piperazine-1-carboxylate dissolved in 18 mL of THF, was added (S)-tetrahydrofuran-3-ol (88 mg, 1.0 mmol), followed by 60% NaH (80 mg, 2.0 mmol) and stirred at RT for 2 hr. After 2 hr it was diluted with 30 mL of EtOAc and slowly quench with brine. The organic layer was dried over MgSO4 and concentrated, it was purified using a 40 g silica gel column eluting with 0-10% MeOH/DCM to obtain 301 mg (76% yield) of the desired product. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 2.01-2.13 (m, 1 H) 2.17-2.29 (m, 1 H) 3.57-3.70 (m, 4 H) 3.74-3.84 (m, 4 H) 3.86-4.01 (m, 4 H) 5.27-5.38 (m, 1 H) 6.37 (d, J=7.83 Hz, 1 H) 7.87 (s, 1 H) 8.28 (d, J=7.83 Hz, 1 H)

Provenance & Evidence