[C:1]([N:4]1[C:8]2[N:9]=[CH:10][CH:11]=[C:12]([C:13]#[N:14])[C:7]=2[CH:6]=[CH:5]1)(=[O:3])[CH3:2].CCN(CC)CC.[C:22](OC(=O)C)(=[O:24])[CH3:23]>[Pd].CCOC(C)=O>[C:1]([N:4]1[C:8]2=[N:9][CH:10]=[CH:11][C:12]([CH2:13][NH:14][C:22](=[O:24])[CH3:23])=[C:7]2[CH2:6][CH2:5]1)(=[O:3])[CH3:2]To a mixture of 1-acetyl-1H-pyrrolo[2,3-b]pyridine-4-carbonitrile (0.691 g, example 15, step D), 10% Pd/C (0.702 g), 5 mL of Et3N, and 20 mL of EtOAc was added acetic anhydride (1.0 mL). The mixture was stirred at RT under balloon pressure of H2 for overnight. Solid was removed by filtration through a pad of Celite® and the filtrate was concentrated to yield a white residue, which was purified by chromatography through silica gel (150 g, 1 to 5% MeOH/CHCl3 with 1% NH4OH, stepwise gradient) to afford N-(1-acetyl-2,3-dihydro-1H-pyrrolo[2,3-b]pyridin-4-ylmethyl)-acetamide (0.50 g) as white solid.
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