1.1: Pseudomonas AK lipase / hexane; diethyl ether / 336 h / 20 °C 2.1: 95 percent / DMAP; Et3N / CH2Cl2 / 16 h / 20 °C 3.1: 80 percent / I2; nBuLi / hexane; tetrahydrofuran / -78 - 20 °C 4.1: 60 percent / BH3*Me2S / various solvent(s); diethyl ether / 1.5 h / 20 °C 5.1: 9-BBN / tetrahydrofuran / 4 h / 20 °C 5.2: 60 percent / Cs2CO3; AsPh3 / PdCl2(dppf) / H2O; tetrahydrofuran / 1.5 h 6.1: 93 percent / HF*pyridine / tetrahydrofuran / 36 h / 20 °C 7.1: 92 percent / Dess-Martin periodinane / CH2Cl2 / 1 h / 20 °C 8.1: 87 percent / TiCl4 / CH2Cl2 / 0.25 h / -78 °C 9.1: 89 percent / tetrabutylammonium fluoride / tetrahydrofuran / 0.17 h / 0 °C 10.1: 91 percent / imidazole / dimethylformamide / 36 h / 20 °C 11.1: 95 percent / Dess-Martin periodinane / CH2Cl2 / 2 h / 20 °C 12.1: 62 percent / 2 N NaOH / H2O / 1.5 h / Heating 13.1: Et3N; 2,4,6-trichlorobenzoyl chloride / tetrahydrofuran / 0.08 h / 0 °C 13.2: 73 percent / DMAP / toluene; tetrahydrofuran / 0.5 h / 20 °C 14.1: 82 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / CH2Cl2; H2O / 2.5 h 15.1: 90 percent / trifluoroacetic acid / CH2Cl2 / 2.5 h / 20 °C 16.1: 30 percent aq. H2O2; KHCO3 / methanol; acetonitrile / 24 h / 20 °C View Scheme

1.1: Pseudomonas AK lipase / hexane; diethyl ether / 336 h / 20 °C 2.1: 95 percent / DMAP; Et3N / CH2Cl2 / 16 h / 20 °C 3.1: 80 percent / I2; nBuLi / hexane; tetrahydrofuran / -78 - 20 °C 4.1: 60 percent / BH3*Me2S / various solvent(s); diethyl ether / 1.5 h / 20 °C 5.1: 9-BBN / tetrahydrofuran / 4 h / 20 °C 5.2: 60 percent / Cs2CO3; AsPh3 / PdCl2(dppf) / H2O; tetrahydrofuran / 1.5 h 6.1: 93 percent / HF*pyridine / tetrahydrofuran / 36 h / 20 °C 7.1: 92 percent / Dess-Martin periodinane / CH2Cl2 / 1 h / 20 °C 8.1: 87 percent / TiCl4 / CH2Cl2 / 0.25 h / -78 °C 9.1: 89 percent / tetrabutylammonium fluoride / tetrahydrofuran / 0.17 h / 0 °C 10.1: 91 percent / imidazole / dimethylformamide / 36 h / 20 °C 11.1: 95 percent / Dess-Martin periodinane / CH2Cl2 / 2 h / 20 °C 12.1: 62 percent / 2 N NaOH / H2O / 1.5 h / Heating 13.1: Et3N; 2,4,6-trichlorobenzoyl chloride / tetrahydrofuran / 0.08 h / 0 °C 13.2: 73 percent / DMAP / toluene; tetrahydrofuran / 0.5 h / 20 °C 14.1: 82 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / CH2Cl2; H2O / 2.5 h 15.1: 90 percent / trifluoroacetic acid / CH2Cl2 / 2.5 h / 20 °C View Scheme

1: 80 percent / Pseudomonas AK lipase / hexane / 18 h / 40 °C 2: 94 percent / H2 / Pd/C / tetrahydrofuran / 1 h / 20 °C View Scheme