Tert-butyl 4-{5-[2-{[2-(benzyloxy)-4,6-dimethylpyridin-3-yl]methyl}-8-chloro-1-oxo-7-(propan-2-yloxy)-1,2,3,4-tetrahydroisoquinolin-5-yl]pyridin-2-yl}piperazine-1-carboxylate → 8-chloro-2-[(4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)methyl]-5-[6-(piperazin-1-yl)pyridin-3-yl]-7-(propan-2-yloxy)-3,4-dihydroisoquinolin-1(2H)-one

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Reaction Steps

A mixture of tert-butyl 4-{5-[2-{[2-(benzyloxy)-4,6-dimethylpyridin-3-yl]methyl}-8-chloro-1-oxo-7-(propan-2-yloxy)-1,2,3,4-tetrahydroisoquinolin-5-yl]pyridin-2-yl}piperazine-1-carboxylate (77f, 46 mg, 0.063 mmol) in TFA (2 mL) was stirred at room temperature for 3 hours. After concentrating volatiles under vacuum, the resulting residue was partitioned between ethyl acetate (30 mL) and sodium bicarbonate (30 mL). The organic phase was separated and the aqueous phase was extracted with ethyl acetate (1×30 mL). The combined organic phases were dried over sodium sulfate, concentrated under vacuum, and purified by prep HPLC to give the title compound (Example 77, 5.0 mg, 15% yield) as a solid. 1H NMR (400 MHz, methanol-d4) δ 8.09 (d, J=2.27 Hz, 1H), 7.56 (dd, J=8.59, 2.53 Hz, 1H), 7.09 (s, 1H), 6.88 (d, J=8.84 Hz, 1H), 6.10 (s, 1H), 4.77 (s, 2H), 4.60-4.70 (m, 1H), 3.55-3.63 (m, 4H), 3.35 (t, J=6.06 Hz, 2H), 2.92-3.02 (m, 4H), 2.75 (t, J=6.06 Hz, 2H), 2.30 (s, 3H), 2.24 (s, 3H), 1.36 (d, J=5.81 Hz, 6H); MS 536.3 [M+H].

Provenance & Evidence