N-ethoxalyl-2-ethoxycarbonylethenyltetrahydroquinoline → N-ethoxalyl-2-ethoxycarbonylethyltetrahydroquinoline

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N-Ethoxalyl-2-ethoxycarbonylethenyltetrahydroquinoline (4 g, 12.1 mmol) in ethanol (100 mL) was hydrogenated over 10% palladium on carbon (500 mL) under atmospheric pressure of hydrogen for 1.5 h at room temperature. The mixture was filtered through celite and the filtrate was concentrated to give 3.83 g of N-ethoxalyl-2-ethoxycarbonylethyltetrahydroquinoline (95%): 1H NMR (270 MHz, CDCl3) δ7.03~7.19 (m, 4H), 4.78 (m, 1H), 4.11(q, 4H, J 7 Hz), 2.73 (t, 2H, J=6 Hz), 2.47 (m, 1H), 1.69 (m, 1H), 1.25 (t, 3H, J=7 Hz), 1.11 (t, 3H, J=7Hz).

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