Multi-step reaction with 5 steps 1: phosphoric acid / 5 h / 20 °C / Inert atmosphere2: pyridine / Inert atmosphere3: N-bromosuccinmide / acetic acid / 24 h / 20 °C / Inert atmosphere4: sulfuric acid / methanol / 5 h / 20 °C / Inert atmosphere5: chloro-trimethyl-silane; sodium iodide / acetonitrile / 2 h / Reflux  

Multi-step reaction with 6 steps 1: sodium hydroxide / dichloromethane; water / 0 - 20 °C / Inert atmosphere2: phosphoric acid / 5 h / 20 °C / Inert atmosphere3: pyridine / Inert atmosphere4: N-bromosuccinmide / acetic acid / 24 h / 20 °C / Inert atmosphere5: sulfuric acid / methanol / 5 h / 20 °C / Inert atmosphere6: chloro-trimethyl-silane; sodium iodide / acetonitrile / 2 h / Reflux