1: 100 percent / triethylamine / CH2Cl2 / 2 h / 23 °C 2: 1) Me3SiOTf / 1) 1,1,2-trichloroethane, r.t., 30 min, 2) 113 deg C, 18 h View Scheme

1: 100 percent / LiAl(OBu-t)3H / diethyl ether; tetrahydrofuran / 1 h / 10 - 30 °C 2: 100 percent / triethylamine / CH2Cl2 / 2 h / 23 °C 3: 1) Me3SiOTf / 1) 1,1,2-trichloroethane, r.t., 30 min, 2) 113 deg C, 18 h View Scheme

trimethylsilyl trifluoromethanesulfonate 1) 1,1,2-trichloroethane, r.t., 30 min, 2) 113 deg C, 18 h; Yield given. Multistep reaction. Yields of byproduct given;