Sodium borohydride → 6-tert-butyl-8-fluoro-2-[3-(hydroxymethyl)-4-[5-[[5-(2-methoxyethyl)-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-2-yl]amino]-1-methyl-6-oxo-3-pyridyl]-2-pyridyl]phthalazin-1-one

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Reaction Steps

To a solution of 133e (180 mg, 0.287 mmol) in dichloromethane (5 mL) and methanol (5 mL) was added NaBH4 (21.7 mg, 0.574 mmol). After stirring at room temperature for 1 h, it was quenched with aqueous NH4Cl (5 mL) and concentrated under reduced pressure. The residue was extracted with dichloromethane (3×20 mL) The combined organic layer was washed with brine, dried over Na2SO4, concentrated under reduced pressure, and purified by reverse-phase prep-HPLC to afford 133 (50 mg, 27%) as a white solid. MS-ESI: [M+H]+ 629.3. 1H NMR (500 MHz, DMSO-d6) δ 8.57 (d, J=5.5 Hz, 1H), 8.54 (d, J=2.5 Hz, 1H), 8.22 (s, 1H), 8.04 (d, J=2.5 Hz, 1H), 7.90 (d, J=1.5 Hz, 1H), 7.78 (dd, J=1.5, 13.5 Hz, 1H), 7.51 (d, J=5.5 Hz, 1H), 7.39 (d, J=2.0 Hz, 1H), 5.89 (s, 1H), 4.90-4.88 (m, 1H), 4.42 (s, 2H), 3.92 (t, J=5.5 Hz, 2H), 3.61 (s, 2H), 3.59 (s, 3H), 3.50 (t, J=5.0 Hz, 2H), 3.25 (s, 3H), 2.90 (t, J=5.5 Hz, 2H), 2.67 (t, J=5.0 Hz, 2H), 1.40 (s, 9H).

Provenance & Evidence