1: 80 percent / trifluoroacetic acid / H2O / Ambient temperature 2: 1.) tetraethylammonium bromide; 2.) ethyldiisopropylamine / 1.) dichloromethane, 30 min; 2.) dichloromethane, 3 d, r.t. 3: 98 percent / sodium methoxide / methanol / 8 h / Ambient temperature 4: hydrogen / 10percent palladium-on-carbon / aq. ethanol; methanol / 96 h / Ambient temperature View Scheme