1: triethylamine / toluene / 1.) reflux, 4 h, 2.) room temperature, 12 h 2: 90 percent / LiALH4 / diethyl ether / 0.75 h / Ambient temperature 3: 73 percent / potassium nitrosodisulphonate, AcONa / H2O; methanol / 0.5 h View Scheme

triethylamine in toluene 1.) reflux, 4 h, 2.) room temperature, 12 h; Yield given;

1: triethylamine / toluene / 1.) reflux, 4 h, 2.) room temperature, 12 h 2: 90 percent / LiALH4 / diethyl ether / 0.75 h / Ambient temperature View Scheme