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

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Reaction Steps

A mixture of 147d (140 mg, 0.22 mmol) and lithium hydroxide (132 mg, 5.5 mmol) in i-propanol/THF/water (2:2:1, 10 mL) was stirred at room temperature for 1 hour. The mixture was concentrated under reduced pressure and diluted with water (10 mL). The resulting mixture was extracted with dichloromethane three times. The combined organic layer was concentrated under reduced pressure and the resulting residue was purified by reverse-phase prep-HPLC to afford 147 (40 mg, 31%) as a yellow solid. MS-ESI: [M+H]+ 598.2. 1H NMR (500 MHz, DMSO-d6) δ 8.57-8.53 (m, 3H), 8.32 (s, 1H), 7.90 (s, 1H), 7.77 (d, J=13.0 Hz, 1H), 7.51-7.49 (m, 2H), 7.43 (s, 1H), 7.19 (d, J=8.5 Hz, 1H), 6.88 (dd, J=3.0, 8.5 Hz, 1H), 5.57-5.56 (m, 1H), 4.89-4.87 (m, 1H), 4.55-4.52 (m, 1H), 4.43-4.41 (m, 2H), 4.05-4.02 (m, 2H), 3.60 (s, 3H), 3.45-3.42 (m, 2H), 1.39 (s, 9H).

Provenance & Evidence