Sodium hydride → HCID 67441157, compound

Participants

Reaction Steps

To a solution of 2-hydroxy-4-(1-hydroxy-1,3-dihydro-benzo[c][1,2]oxaborol-5-yloxy)-benzonitrile (D10) (200 mg, 0.75 mmol) in THF (50 mL) was added NaH (43 mg, 95%, 1.81 mmol) portion-wise. The mixture was stirred at room temperature for 5 minutes, followed by the slow addition of t-butyl bromoacetate (0.25 mL, 1.65 mmol). The reaction was heated at 70° C. for 24 hours. After the cooling of the reaction solution to room temperature, the mixture was filtered. The filtrate was evaporated under vacuum. The residue was purified using reverse phase chromatography, eluting from 5% MeOH/H2O to 90% MeOH/H2O, afforded 36 mg of the title compound in 12.6% yield. 1H NMR 400 MHz (DMSO-d6) δ: 9.26 (s, 1H), 7.78 (d, J=8.2 Hz, 1H), 7.75 (d, J=8.6 Hz, 1H), 7.14 (s, 1H), 7.09 (dd, J=2.3, 8.2 Hz, 1H), 6.74 (d, J=2.3 Hz, 1H), 6.68 (dd, J=2.0, 8.6 Hz, 1H), 4.96 (s, 2H), 4.86 (s, 2H), 1.37 (s, 9H); MS (ES) m/z: 380 (M−H)−; HPLC purity: 99.11% (220 nm), 98.48% (254 nm).

Provenance & Evidence