1: 1) ClCO2Bu-i, N-methylmorpholine / 1) THF, 0 deg C, 4 min, 2) THF, a) 0 deg C, 15 min, b) r.t., 1 h 2: 89 percent / H2 / 20percent Pd(OH)2/C / methanol / 4 h / 26 °C / 1520 Torr View Scheme

With  trifluoroacetic acid in  dichloromethane  Ambient temperature;   

Multi-step reaction with 3 steps 1: 85 percent / Et3N / tetrahydrofuran / 1 h2: 92 percent / NaH / tetrahydrofuran / 36 h / Ambient temperature3: 100 percent / CF3CO2H / CH2Cl2 / Ambient temperature  

Multi-step reaction with 2 steps 1: 92 percent / NaH / tetrahydrofuran / 36 h / Ambient temperature2: 100 percent / CF3CO2H / CH2Cl2 / Ambient temperature