copper in quinoline T=210°C; 1 h; Yield given;

sodium hydroxide in methanol; water 0.5 h; Heating;

1: 91 percent / aq. HCl; ethanol / 1 h / Heating 2: 65 percent / 4A mol. sieves / tetrahydrofuran / 5 h / Ambient temperature 3: 77 percent / NaOH / methanol; H2O / 0.5 h / Heating View Scheme

1: 65 percent / 4A mol. sieves / tetrahydrofuran / 5 h / Ambient temperature 2: 77 percent / NaOH / methanol; H2O / 0.5 h / Heating View Scheme