Ammonium formate → 2-[4-(6-fluoro-1H-indol-3-ylmethyl)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-N-isopropyl-N-(6-methoxy-pyridin-3-yl)-acetamide

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To a solution of 2-[4-(6-fluoro-1H-indol-3-ylmethylene)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-N-isopropyl-N-(6-methoxy-pyridin-3-yl)-acetamide (158 mg, 0.252 mmol) in MeOH (20 mL) was added ammonium formate (463 mg, 7.34 mmol) and 10% palladium on charcoal (112 mg). The reaction was heated at reflux for 24 hours. The suspension was filtered hot, rinsing with 10% MeOH in CH2Cl2 (3×) and with CH2Cl2 (3×). The combined organic filtrates were concentrated and the residue was purified by medium pressure chromatography eluting with a solvent gradient (2% MeOH in CH2Cl2 to 8% MeOH in CH2Cl2) to yield 110 mg of 2-[4-(6-fluoro-1H-indol-3-ylmethyl)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-N-isopropyl-N-(6-methoxy-pyridin-3-yl)-acetamide. 1H NMR (CD3OD) δ 8.08 (d, 1H), 7.39-7.62 (m, 9H) 7.15 (m, 2H), 6.93 (m, 3H), 6.68 (m, 1H), 4.80 (m, 1H), 4.55 (m, 1H), 4.20 (m, 1H), 3.95 (s, 3H), 3.88 (t, 1H), 3.77 (m, 1H), 3.67 (m, 1H), 1.01 (m, 6H); MS 630 (M+1), 628.5 (M−1).

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