Sodium borohydride → 10-fluoro-2-[3-(hydroxymethyl)-4-[1-methyl-5-[(5-methyl-6,7-dihydro-4H-thiazolo[5,4-c]pyridin-2-yl)amino]-6-oxo-3-pyridyl]-2-pyridyl]-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-1-one

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Reaction Steps

Compound 223a (160 mg, 0.27 mmol) was dissolved in methanol (30 mL), followed by addition of NaBH4 (31 mg, 082 mmol) at 0° C. The reaction mixture was stirred for 30 min and then quenched with water (10 mL). It was concentrated under reduced pressure and the residue was extracted with dichloromethane (3×30 mL). The combined organic phase was concentrated under reduced pressure and the residual was purified by reverse-phase prep-HPLC to afford 223 (56 mg, 35%) as a white solid. MS-ESI: [M+H]+ 590.2. 1H NMR (500 MHz, DMSO-d6): δ 9.92 (s, 1H), 8.64 (d, J=2.5 Hz, 1H), 8.48 (d, J=5.5 Hz, 1H), 7.56 (d, J=2.0 Hz, 1H), 7.34 (d, J=5.0 Hz, 1H), 4.93 (t, J=5.5 Hz, 1H), 4.46-4.41 (m, 2H), 4.19-4.17 (m, 2H), 4.08-4.03 (m, 1H), 3.88-3.85 (m, 1H), 3.60 (s, 3H), 3.42 (s, 2H), 2.63-2.58 (m, 6H), 2.41 (s, 3H), 2.34 (s, 2H), 1.78-1.76 (m, 2H), 1.68-1.66 (m, 2H).

Provenance & Evidence