1.1: boron trifluoride diethyl etherate / dichloromethane / 2 h / |Inert atmosphere 1.2: |Inert atmosphere 2.1: sulfuric acid; lithium aluminium tetrahydride / tetrahydrofuran / 1 h / 0 °C / |Inert atmosphere; |Reflux View Scheme

With  boron trifluoride diethyl etherate in  dichloromethane 2 h;