1: With hydrogenchloride; water in tetrahydrofuran T=60°C; 3 h; 2: With sodium hydrogencarbonate in tetrahydrofuran; water T=20°C; pH=7;

1.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 0 °C 1.2: 20 °C 2.1: n-butyllithium / tetrahydrofuran / 1 h / -78 °C 2.2: 1 h / -78 °C 3.1: hydrogenchloride / water; methanol / 4 h / |Reflux View Scheme

potassium carbonate in N,N-dimethyl-formamide T=60°C; 3 h;