palladium on activated charcoal; Rh on carbon; Amberlite IR 45 (acetate form); hydrogen; triethylamine; dicyclohexyl-carbodiimide 1.) DMF, 0 deg C, 4 h, 2.) aq. AcOH, 2 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

1: 70 percent / 1-hydroxybenzotriazole, DCC, Et3N / dimethylformamide / 0 deg C to room temperature 2: TFA / 0.5 h / Ambient temperature 3: 79 percent / Et3N / dimethylformamide / 16 h 4: 76 percent / Amberlite IR 45 (acetate form), H2 / Rh-C, Pd-C / aq. acetic acid / 6 h View Scheme