1: trifluoroacetic acid / dichloromethane / -78 - 20 °C / Inert atmosphere 2: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 2 h / 0 °C 3: palladium 10 on activated carbon; hydrogen / methanol / 1500.15 Torr 4: dibromo-difluoro-methane; tert-butyl alcohol / dichloromethane / 1.5 h / 80 °C / Inert atmosphere; Microwave irradiation View Scheme