1: dicyclohexylcarbodiimide / CHCl3 / 3 h / -20 - 0 °C / r.t., overnight 2: 86 percent / hydrogen / palladium black / 2-methyl-propan-2-ol / 16 h 3: trifluoroacetic acid View Scheme

1: dicyclohexylcarbodiimide / CHCl3 / 3 h / -20 - 0 °C / r.t., overnight 2: 86 percent / hydrogen / palladium black / 2-methyl-propan-2-ol / 16 h 3: 57 percent / 1-hydroxybenzotriazol, dicyclohexylcarbodiimide / dimethylformamide / 1 h / -20 - 0 °C / O deg C, overnight 4: ammonium formate / 10percent palladium on carbon / methanol / 3 h / Ambient temperature 5: anisol, trifluoroacetic acid / 1 h / Ambient temperature View Scheme