1: 86 percent / aq. HgCl2; CaCO3 / acetonitrile / 1 h / 20 °C 2: 90 percent / NaBH4 / methanol; H2O / 10 h View Scheme

Multi-step reaction with 3 steps 1: water, sulfuric acid / methanol / 2 h / Heating2: 94 percent / zinc chloride / 0.25 h / Ambient temperature3: 91 percent / sodium hydride, tetra-n-butylammonium iodide / tetrahydrofuran / Ambient temperature