1: 88 percent / 3-chloroperbenzoic acid / CH2Cl2 / 2.5 h / -5 °C 2: 70 percent / N,N-di-isopropylethylamine / N,N-dimethyl-acetamide / 28 h / 70 - 75 °C 3: 0.65 g / aq. formic acid / 3 h / Ambient temperature 4: hydrogen / palladium on carbon / ethanol; acetic acid; H2O / 2 h View Scheme