Lithium Hydroxide → 2-(1-Methyl-6-oxopyrido[2,3-e]pyrrolo[1,2-a]pyrazin-5(6H)-yl)acetic acid

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Methyl 2-(1-methyl-6-oxopyrido[2,3-e]pyrrolo[1,2-a]pyrazin-5(6H)-yl)acetate (517 mg, 1.91 mmol) was dissolved in 20 mL of MeOH/H2O/THF (1:1:4). LiOH (68.5 mg, 2.86 mmol) was added. The mixture was stirred at room temperature for 16 hours. The solvents were removed and residue was dissolved in water, washed with ether, then neutralized with 2N HCl to pH=3. 356 mg (73%) white solid was obtained after filtration and dried under vacuum. 1H NMR (400 MHz, DMSO) δ 12.90 (s, 1H), 8.27-8.17 (m, 2H), 7.29-7.19 (m, 2H), 6.80 (dd, J=2.9, 3.9 Hz, 1H), 5.02 (s, 2H), 2.85 (s, 3H). 13C NMR (101 MHz, DMSO, APT) δ 169.8, 154.5, 143.1, 141.4, 135.9, 123.9, 123.3, 122.8, 119.5, 113.3, 112.7, 41.6, 22.2. HRMS (m/z): calcd for C13H12N3O3 (M+H) 258.0879. found 258.0894.

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