N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline in ethanol 20 h; Ambient temperature;

1: 74 percent / boron trifluoride-methanol complex 2: 71 percent / hydrogen / 5percent Pd-C / methanol / 4 h / 3750.3 Torr 3: 52 percent / N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline / ethanol / 20 h / Ambient temperature View Scheme

1: 71 percent / hydrogen / 5percent Pd-C / methanol / 4 h / 3750.3 Torr 2: 52 percent / N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline / ethanol / 20 h / Ambient temperature View Scheme