1: 88 percent / Zn, 1.) M aq. KH2PO4 / tetrahydrofuran / 4 h / Ambient temperature 2: 95 percent / H2 / 10percent Pd/C / methanol / 1 h / Ambient temperature View Scheme

1: 88 percent / Zn, 1.) M aq. KH2PO4 / tetrahydrofuran / 4 h / Ambient temperature 2: 95 percent / H2 / 10percent Pd/C / methanol / 1 h / Ambient temperature 3: 72 percent / methanol / Ambient temperature 4: 98 percent / H2, NaOH / Raney nickel / ethanol; H2O / 3 h / 760 Torr / Ambient temperature; pH 10 View Scheme