1: With hydrogenchloride in tetrahydrofuran 4 h; 2: With potassium carbonate in tetrahydrofuran pH=9; 1 h;

1.1: 70 percent / TMSCl; Mg / dimethylformamide 2.1: 91 percent / camphorsulfonic acid / toluene / 8 h / Heating 3.1: 85 percent / LiAlH4 / tetrahydrofuran / 9 h / 0 - 20 °C 4.1: aq. HCl / tetrahydrofuran / 4 h 4.2: 93 percent / K2CO3 / tetrahydrofuran / 1 h / pH 9 View Scheme

1.1: 91 percent / camphorsulfonic acid / toluene / 8 h / Heating 2.1: 85 percent / LiAlH4 / tetrahydrofuran / 9 h / 0 - 20 °C 3.1: aq. HCl / tetrahydrofuran / 4 h 3.2: 93 percent / K2CO3 / tetrahydrofuran / 1 h / pH 9 View Scheme

1.1: 85 percent / LiAlH4 / tetrahydrofuran / 9 h / 0 - 20 °C 2.1: aq. HCl / tetrahydrofuran / 4 h 2.2: 93 percent / K2CO3 / tetrahydrofuran / 1 h / pH 9 View Scheme