Lithium hydroxide, monohydrate → (R)-2-(4-(6-(4-(1,4-dimethyl-3-oxopiperazin-2-yl)phenylamino)-4-methyl-5-oxo-4,5-dihydropyrazin-2-yl)-3-(hydroxymethyl)pyridin-2-yl)-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-1(2H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 114b (360 mg, 0.54 mmol) and LiOH.H2O (138 mg, 2.76 mmol) in iPrOH/THF (1:1, 3 mL) and H2O (1 mL) was stirred at 30° C. for 2 h. The mixture was evaporated in vacuo and the residue was extracted with EtOAc (10 mL×2). The combined EtOAc extract was concentrated under reduced pressure and the residue was purified with reverse-phase prep-HPLC to afford 114 (72 mg, 21%) as a white solid. LCMS: [M+H]+ 623. 1H NMR (500 MHz, CDCl3) δ 8.53 (d, J=4.5, 1H), 8.31 (s, 1H), 8.10 (s, 1H), 7.83-7.78 (m, 3H), 7.36 (d, J=8.0, 2H), 6.89 (s, 1H), 5.12-5.14 (m, 1H), 4.68-4.70 (m, 1H), 4.49-4.53 (m, 1H), 4.38-4.43 (m, 1H), 4.15-4.06 (m, 2H), 3.89-3.90 (m, 1H), 3.72-3.73 (m, 2H), 3.65 (s, 3H), 3.21-3.22 (m, 1H), 3.01-3.03 (m, 4H), 2.71-2.56 (m, 5H), 2.20 (s, 3H), 1.90-1.92 (m, 2H), 1.79-1.80 (m, 2H)

Provenance & Evidence