1: 97 percent / N,N-ethyldiisopropylamine / benzene / 72 h / Ambient temperature 2: 90 percent / 1 M H2SO4 / propan-2-ol; H2O / 22 h / Heating 3: DBU / CH2Cl2 / 1 h 4: H2 / 10percent Pd/C / ethyl acetate View Scheme