1.1: boron trifluoride diethyl etherate / dichloromethane / 20 °C 2.1: n-butyllithium / tetrahydrofuran / 2 h / -78 °C 2.2: 1 h / -78 °C 3.1: N-chloro-succinimide; silver nitrate / acetonitrile; water / 20 °C View Scheme

1.1: n-butyllithium / tetrahydrofuran / 2 h / -78 °C 1.2: 1 h / -78 °C 2.1: N-chloro-succinimide; silver nitrate / acetonitrile; water / 20 °C View Scheme

potassium cyanide; ethanol