Sodium borohydride → 6-Tert-butyl-2-[4-[5-[(5-ethylisoxazol-3-yl)amino]-1-methyl-6-oxo-3-pyridyl]-3-(hydroxymethyl)-2-pyridyl]-8-fluoro-phthalazin-1-one

Participants

Reaction Steps

To a solution of 158c (190 mg, 0.35 mmol) in dichloromethane (5 mL) and methanol (5 mL) was added NaBH4 (26.5 mg, 0.70 mmol). The reaction mixture was stirred at room temperature for 1 h and quenched with aqueous NH4Cl. It was then concentrated under reduced pressure and the residue was extracted with dichloromethane. The combined extract was washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by reverse-phase prep-HPLC to afford 158 (70 mg, 37%) as white solid. MS-ESI: [M+H]+ 545.3. 1H NMR (500 MHz, DMSO-d6) δ 9.01 (s, 1H), 8.58 (d, J=5.0 Hz, 1H), 8.54 (d, J=2.0 Hz, 1H), 8.01 (d, J=2.0 Hz, 1H), 7.90 (s, 1H), 7.79 (d, J=13 Hz, 1H), 7.57 (d, J=2.5 Hz, 1H), 7.51 (d, J=5.0 Hz, 1H), 6.26 (s, 1H), 4.90 (s, 1H), 4.44-4.43 (m, 2H), 3.61 (s, 3H), 2.69-2.65 (m, 2H), 1.40 (s, 9H), 1.19 (t, J=8.0 Hz, 3H)

Provenance & Evidence