1: 72 percent / NaNH2 / benzene / 1.) reflux, 5 h; 2.) 45 deg C, 17.5 h. 2: 1.) mercuric acetate; 2.) LiCl, PdCl2, CuCl2. / 1.) room temperature, CH3OH, 15 min; 2.) 55 deg C, CH3OH, 1 hour. 3: 73 percent / HCl / acetic acid / 21 h / Ambient temperature 4: 81 percent / SiO2 / CHCl3 / 27 h / 60 °C View Scheme

1: 72 percent / NaNH2 / benzene / 1.) reflux, 5 h; 2.) 45 deg C, 17.5 h. 2: 1.) mercuric acetate; 2.) LiCl, PdCl2, CuCl2. / 1.) room temperature, CH3OH, 15 min; 2.) 55 deg C, CH3OH, 1 hour. 3: 73 percent / HCl / acetic acid / 21 h / Ambient temperature 4: Al2O3 / hexane / 24 h / 60 °C View Scheme