1: 91 percent / aq. NaOH / 2-methyl-propan-2-ol / Ambient temperature 2: H2 / 5percent Pd/C / methanol; H2O / 24 h / 2585.7 Torr 3: dimethylformamide / 120 h / Ambient temperature View Scheme

1: 91 percent / aq. NaOH / 2-methyl-propan-2-ol / Ambient temperature 2: H2 / 5percent Pd/C / methanol; H2O / 24 h / 2585.7 Torr 3: dimethylformamide / 120 h / Ambient temperature View Scheme

1: 1.) basic copper carbonate, 2.) NaOH / 1.) H2O, reflux, 2.5 h, 2.) RT, overnight 2: 91 percent / aq. NaOH / 2-methyl-propan-2-ol / Ambient temperature 3: H2 / 5percent Pd/C / methanol; H2O / 24 h / 2585.7 Torr 4: dimethylformamide / 120 h / Ambient temperature View Scheme

1: H2 / 5percent Pd/C / methanol; H2O / 24 h / 2585.7 Torr 2: dimethylformamide / 120 h / Ambient temperature View Scheme

1: 38 percent / DCC / tetrahydrofuran / Ambient temperature 2: dimethylformamide / 120 h / Ambient temperature View Scheme

in N,N-dimethyl-formamide 120 h; Ambient temperature; Yield given;