1: 100 percent / diethyl ether; tetrahydrofuran / 1.17 h / Heating 2: 100 percent / trifluoroacetic acid / CHCl3 / 3 h / Ambient temperature View Scheme

1: 100 percent / diethyl ether; tetrahydrofuran / 1.17 h / Heating 2: 100 percent / trifluoroacetic acid / CHCl3 / 3 h / Ambient temperature 3: 92 percent / H2 / PtO2 / ethyl acetate / 2 h / 760 Torr / Ambient temperature View Scheme