Lithium hydroxide, monohydrate → N-[(1S)-2-[[6-[[5-[5-fluoro-2-(hydroxymethyl)-3-(4-oxo-6,7,8,9-tetrahydrobenzothiopheno[2,3-d]pyridazin-3-yl)phenyl]-1-methyl-2-oxo-3-pyridyl]amino]-2-pyridyl]oxy]-1-methyl-ethyl]prop-2-enamide

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Reaction Steps

To a mixture of 108d (70 mg, 0.1 mmol) in THF (6 mL), i-PrOH (2 mL) and H2O (2 mL) was added LiOH.H2O (42 mg, 1 mmol). The reaction mixture was stirred at rt for 16 h and concentrated. The residue was purified by prep-HPLC to give 108 (20 mg, 8% for two steps) as yellow solid. 1H NMR (500 MHz, DMSO-d6): δ 8.61 (d, J=10 Hz, 2H), 8.49 (s, 1H), 8.04-8.03 (m, 1H), 7.52-7.50 (m, 2H), 7.40-7.35 (m, 2H), 6.87 (d, J=8 Hz, 1H), 6.21-6.15 (m, 2H), 6.05-6.02 (m, 1H), 5.54 (d, J=10 Hz, 1H), 4.73 (bs, 1H), 4.30 (bs, 2H), 4.15 (bs, 2H), 4.02 (bs, 1H), 3.61 (s, 3H), 2.93 (bs, 2H), 2.84 (bs, 2H), 1.86 (bs, 4H), 0.97 (bs, 3H). ESI-LCMS: m/z=657.3 [C34H33FN6O5S+H]+

Provenance & Evidence