1: 91 percent / CH2Cl2 / -78 °C 2: 99 percent / benzene / Heating 3: 94 percent / DIBAL-H / tetrahydrofuran / -78 °C 4: 93 percent / CH2Cl2 / -78 °C 5: 75 percent / Me3Al / CH2Cl2 / 4 h / 0 °C 6: NaBH4 / ethanol / 0 °C 7: 92 percent / imidazole; 4-DMAP / CH2Cl2 8: 62 percent / bromotrimethylsilane / CH2Cl2 9: 95 percent / CH2Cl2 10: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 11: 99 percent / n-Bu4NF / dimethylformamide 12: 99 percent / CH2Cl2 13: 92 percent / Zn / benzene / Heating 14: 83 percent / Dess-Martin periodinane / CH2Cl2 15: 96 percent / toluene / Heating 16: 99 percent / HF / acetonitrile 17: NaH / CH2Cl2 View Scheme

1: 75 percent / Me3Al / CH2Cl2 / 4 h / 0 °C 2: NaBH4 / ethanol / 0 °C 3: 92 percent / imidazole; 4-DMAP / CH2Cl2 4: 62 percent / bromotrimethylsilane / CH2Cl2 5: 95 percent / CH2Cl2 6: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 7: 99 percent / n-Bu4NF / dimethylformamide 8: 99 percent / CH2Cl2 9: 92 percent / Zn / benzene / Heating 10: 83 percent / Dess-Martin periodinane / CH2Cl2 11: 96 percent / toluene / Heating 12: 99 percent / HF / acetonitrile 13: NaH / CH2Cl2 View Scheme

1: 92 percent / imidazole; 4-DMAP / CH2Cl2 2: 62 percent / bromotrimethylsilane / CH2Cl2 3: 95 percent / CH2Cl2 4: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 5: 99 percent / n-Bu4NF / dimethylformamide 6: 99 percent / CH2Cl2 7: 92 percent / Zn / benzene / Heating 8: 83 percent / Dess-Martin periodinane / CH2Cl2 9: 96 percent / toluene / Heating 10: 99 percent / HF / acetonitrile 11: NaH / CH2Cl2 View Scheme

1: 94 percent / DIBAL-H / tetrahydrofuran / -78 °C 2: 93 percent / CH2Cl2 / -78 °C 3: 75 percent / Me3Al / CH2Cl2 / 4 h / 0 °C 4: NaBH4 / ethanol / 0 °C 5: 92 percent / imidazole; 4-DMAP / CH2Cl2 6: 62 percent / bromotrimethylsilane / CH2Cl2 7: 95 percent / CH2Cl2 8: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 9: 99 percent / n-Bu4NF / dimethylformamide 10: 99 percent / CH2Cl2 11: 92 percent / Zn / benzene / Heating 12: 83 percent / Dess-Martin periodinane / CH2Cl2 13: 96 percent / toluene / Heating 14: 99 percent / HF / acetonitrile 15: NaH / CH2Cl2 View Scheme

1: 83 percent / Dess-Martin periodinane / CH2Cl2 2: 96 percent / toluene / Heating 3: 99 percent / HF / acetonitrile 4: NaH / CH2Cl2 View Scheme

1: 94 percent / i-Pr2NEt; 4-DMAP / CH2Cl2 2: 98 percent / n-Bu4NF / tetrahydrofuran 3: 91 percent / CH2Cl2 / -78 °C 4: 99 percent / benzene / Heating 5: 94 percent / DIBAL-H / tetrahydrofuran / -78 °C 6: 93 percent / CH2Cl2 / -78 °C 7: 75 percent / Me3Al / CH2Cl2 / 4 h / 0 °C 8: NaBH4 / ethanol / 0 °C 9: 92 percent / imidazole; 4-DMAP / CH2Cl2 10: 62 percent / bromotrimethylsilane / CH2Cl2 11: 95 percent / CH2Cl2 12: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 13: 99 percent / n-Bu4NF / dimethylformamide 14: 99 percent / CH2Cl2 15: 92 percent / Zn / benzene / Heating 16: 83 percent / Dess-Martin periodinane / CH2Cl2 17: 96 percent / toluene / Heating 18: 99 percent / HF / acetonitrile 19: NaH / CH2Cl2 View Scheme

1: 99 percent / DIBAL-H / tetrahydrofuran / -78 °C 2: 94 percent / i-Pr2NEt; 4-DMAP / CH2Cl2 3: 98 percent / n-Bu4NF / tetrahydrofuran 4: 91 percent / CH2Cl2 / -78 °C 5: 99 percent / benzene / Heating 6: 94 percent / DIBAL-H / tetrahydrofuran / -78 °C 7: 93 percent / CH2Cl2 / -78 °C 8: 75 percent / Me3Al / CH2Cl2 / 4 h / 0 °C 9: NaBH4 / ethanol / 0 °C 10: 92 percent / imidazole; 4-DMAP / CH2Cl2 11: 62 percent / bromotrimethylsilane / CH2Cl2 12: 95 percent / CH2Cl2 13: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 14: 99 percent / n-Bu4NF / dimethylformamide 15: 99 percent / CH2Cl2 16: 92 percent / Zn / benzene / Heating 17: 83 percent / Dess-Martin periodinane / CH2Cl2 18: 96 percent / toluene / Heating 19: 99 percent / HF / acetonitrile 20: NaH / CH2Cl2 View Scheme

1: 98 percent / n-Bu4NF / tetrahydrofuran 2: 91 percent / CH2Cl2 / -78 °C 3: 99 percent / benzene / Heating 4: 94 percent / DIBAL-H / tetrahydrofuran / -78 °C 5: 93 percent / CH2Cl2 / -78 °C 6: 75 percent / Me3Al / CH2Cl2 / 4 h / 0 °C 7: NaBH4 / ethanol / 0 °C 8: 92 percent / imidazole; 4-DMAP / CH2Cl2 9: 62 percent / bromotrimethylsilane / CH2Cl2 10: 95 percent / CH2Cl2 11: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 12: 99 percent / n-Bu4NF / dimethylformamide 13: 99 percent / CH2Cl2 14: 92 percent / Zn / benzene / Heating 15: 83 percent / Dess-Martin periodinane / CH2Cl2 16: 96 percent / toluene / Heating 17: 99 percent / HF / acetonitrile 18: NaH / CH2Cl2 View Scheme

1: 93 percent / chromous chloride / tetrahydrofuran / 20 °C 2: 99 percent / n-Bu4NF / dimethylformamide 3: 99 percent / CH2Cl2 4: 92 percent / Zn / benzene / Heating 5: 83 percent / Dess-Martin periodinane / CH2Cl2 6: 96 percent / toluene / Heating 7: 99 percent / HF / acetonitrile 8: NaH / CH2Cl2 View Scheme

1: 99 percent / n-Bu4NF / dimethylformamide 2: 99 percent / CH2Cl2 3: 92 percent / Zn / benzene / Heating 4: 83 percent / Dess-Martin periodinane / CH2Cl2 5: 96 percent / toluene / Heating 6: 99 percent / HF / acetonitrile 7: NaH / CH2Cl2 View Scheme