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

<b>Multi-step reaction with 2 steps<br /> </b>1: (i) aq. H₂SO₄, NaNO₂, (ii) NaBF₄, H₂O<br />2: Cu, MgSO₄ <br /> <br /> &nbsp;