1: 1.) lithium bis(trimethylsilyl)amide / 1.) THF, -78 deg C, 1 h, 2.) THF, a) -78 deg C, 1 h, b) from -78 deg C to RT, 2 h 2: trifluoroacetic acid / 1.5 h / Ambient temperature 3: H2 / 10percent Pd/C / ethanol / 3 h / Ambient temperature View Scheme