1.1: lithium aluminium tetrahydride / tetrahydrofuran / 1 h / 70 °C 1.2: 0.17 h / 20 °C 2.1: camphor-10-sulfonic acid / methanol / 6 h / 20 °C 3.1: Dess-Martin periodane / dichloromethane / 0.5 h / 40 °C 4.1: trifluoroacetic acid / water; toluene / 2 h / 50 °C 5.1: N-ethyl-N,N-diisopropylamine / dichloromethane / 0.17 h / 0 °C 6.1: mercaptoacetic acid; triethylamine / dichloromethane / 0.5 h / 0 °C 6.2: 0.5 h / 20 °C View Scheme

1.1: lithium aluminium tetrahydride / tetrahydrofuran / 1 h / 70 °C 1.2: 0.17 h / 20 °C 2.1: camphor-10-sulfonic acid / methanol / 6 h / 20 °C 3.1: Dess-Martin periodane / dichloromethane / 0.5 h / 40 °C 4.1: trifluoroacetic acid / water; toluene / 2 h / 50 °C 5.1: N-ethyl-N,N-diisopropylamine / dichloromethane / 0.17 h / 0 °C 6.1: mercaptoacetic acid; triethylamine / dichloromethane / 0.5 h / 0 °C 6.2: 0.5 h / 20 °C 7.1: sodium tetrahydroborate / methanol / 20 °C 8.1: boron tribromide / dichloromethane / 0.17 h / 20 °C View Scheme

1.1: lithium aluminium tetrahydride / tetrahydrofuran / 1 h / 70 °C 1.2: 0.17 h / 20 °C 2.1: camphor-10-sulfonic acid / methanol / 6 h / 20 °C 3.1: Dess-Martin periodane / dichloromethane / 0.5 h / 40 °C 4.1: trifluoroacetic acid / water; toluene / 2 h / 50 °C 5.1: N-ethyl-N,N-diisopropylamine / dichloromethane / 0.17 h / 0 °C 6.1: mercaptoacetic acid; triethylamine / dichloromethane / 0.5 h / 0 °C 6.2: 0.5 h / 20 °C 7.1: sodium tetrahydroborate / methanol / 20 °C View Scheme

1.1: lithium aluminium tetrahydride / tetrahydrofuran / 1 h / 70 °C 1.2: 0.17 h / 20 °C 2.1: camphor-10-sulfonic acid / methanol / 6 h / 20 °C 3.1: Dess-Martin periodane / dichloromethane / 0.5 h / 40 °C 4.1: trifluoroacetic acid / water; toluene / 2 h / 50 °C 5.1: N-ethyl-N,N-diisopropylamine / dichloromethane / 0.17 h / 0 °C 6.1: mercaptoacetic acid; triethylamine / dichloromethane / 0.5 h / 0 °C 6.2: 0.5 h / 20 °C View Scheme