1: 52 percent / H2SO3 / 1,2-dimethoxy-ethane / 8 h / 80 °C 2: 73 percent / LAH / diethyl ether / 18 h / Ambient temperature 3: 1) THF, r.t., 2) 175 deg C, 5 h View Scheme

1: 52 percent / H2SO3 / 1,2-dimethoxy-ethane / 8 h / 80 °C 2: 73 percent / LAH / diethyl ether / 18 h / Ambient temperature 3: 1) THF, r.t., 2) 175 deg C, 5 h View Scheme

1: 73 percent / LAH / diethyl ether / 18 h / Ambient temperature 2: 1) THF, r.t., 2) 175 deg C, 5 h View Scheme

1) THF, r.t., 2) 175 deg C, 5 h; Yield given. Multistep reaction;