1: 87 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 / H2 / 10percent Pd/C / methanol / 1 h / Ambient temperature 2: TFA / 1 h / Ambient temperature View Scheme