1.1: Candida antarctica B lipase; Na2HPO4 buffer / 0.5 h / 20 °C / pH 7.5 / Enzymatic reaction 2.1: Bu4N(1+)*Cl(1-); K2CO3; CuI / dimethylformamide / 0.25 h / 20 °C 2.2: 69 percent / dimethylformamide / 8 h / 20 °C View Scheme