hydrogenchloride; water 10 h; Reflux;

1.1: triethylamine / toluene / 24 h / 20 °C 2.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -78 °C 2.2: -78 - 20 °C 3.1: sodium tetrahydroborate / methanol / 5 h 4.1: hydrogenchloride; water / 10 h / Reflux View Scheme

1.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -78 °C 1.2: -78 - 20 °C 2.1: sodium tetrahydroborate / methanol / 5 h 3.1: hydrogenchloride; water / 10 h / Reflux View Scheme