Lithium Hydroxide → 2-[3'-Hydroxymethyl-1-methyl-6-oxo-5-(pyrazin-2-ylamino)-1,6-dihydro-[3,4']bipyridinyl-2'-yl]-3,4,6,7,8,9-hexahydro-2H-pyrazino[1,2-a]indol-1-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 162b (110 mg, 0.20 mmol) and lithium hydroxide (84 mg, 2.0 mmol) in i-propanol/THF (1:1, 4 mL) and water (1 mL) was stirred at 30° C. for 1 h. The mixture was evaporated in vacuo and the residue was diluted with water and ethyl acetate. The water phase was separated and extracted with ethyl acetate (2×10 mL). The combined ethyl acetate extract was concentrated under reduced pressure and the residue was purified by reverse-phase prep-HPLC to afford 162 (85 mg, 85%) as pale yellow solid. MS-ESI: [M+H]+ 498.3. 1H NMR (500 MHz, CHCl3) δ 8.73 (d, J=2.5 Hz, 1H), 8.54 (d, J=5 Hz, 1H), 8.29 (s, 1H), 8.15-8.14 (m, 2H), 8.01 (d, J=2.5 Hz, 1H), 8.00 (d, J=2.0 Hz, 1H), 7.37 (d, J=5 Hz, 1H), 6.91 (s, 1H), 4.66-4.65 (m, 1H), 4.52-4.51 (m, 1H), 4.32-4.31 (m, 1H), 4.18-4.17 (m, 1H), 4.14-4.12 (m, 1H), 3.90-3.88 (m, 1H), 3.75 (s, 3H), 2.62-2.57 (m, 4H), 1.92-1.88 (m, 3H), 1.80-1.79 (m, 2H).

Provenance & Evidence