1: 1) trifluoroacetic anhydride, dimethylsulphoxide, 2) ethyldiisopropylamine / 1) CH2Cl2, -78 deg C, 30 min, 2) 45 min 2: 78 percent 3: 1) hydrogen, acetic acid, 2) potassium carbonate / 1) platinum(VI) oxide / 1) ethyl acetate, 1 atm, 14 h, 2) methanol, 3 h 4: 90 percent / hydrogen, acetic acid / Pd(OH)2 / C / methanol / 2 h / 2585.7 Torr View Scheme

N-ethyl-N,N-diisopropylamine; trifluoroacetic anhydride in methanol; dichloromethane

dimethyl sulfoxide; N-ethyl-N,N-diisopropylamine; trifluoroacetic anhydride 1) CH2Cl2, -78 deg C, 30 min, 2) 45 min; Yield given. Multistep reaction;