1: N-bromosuccinmide; dibenzoyl peroxide / 1,2-dichloro-ethane / 10 h / |Reflux; |Inert atmosphere 2: palladium 10 on activated carbon; hydrogen / ethyl acetate; dichloromethane / 10 h / 20 °C / |Inert atmosphere 3: boron trifluoride diethyl etherate; tert.-butylnitrite / dichloromethane / 1 h / 0 - 20 °C / |Inert atmosphere 4: water / tetrahydrofuran / 1 h / 60 °C / |Inert atmosphere View Scheme