1.1: 96 percent / Et3N; DMAP / CH2Cl2 / 6 h / 20 °C 2.1: 9-BBN / tetrahydrofuran / 1.5 h / 28 °C / microwave irradiation 2.2: 37 percent / K3PO4*3H2O; H2O / PdCl2(dppf) / tetrahydrofuran; dimethylformamide / 1 h / 60 °C 3.1: 93 percent / aq. NaOH / methanol / 36 h / 50 °C 4.1: Et3N; 2,4,6-trichlorobenzoyl chloride / tetrahydrofuran / 0.33 h / 20 °C 4.2: 90 percent / DMAP / toluene; tetrahydrofuran / 1 h 5.1: 92 percent / HF*pyridine / tetrahydrofuran 6.1: 97 percent / 3,3-dimethyldioxirane / CH2Cl2 / -35 °C View Scheme

1.1: 96 percent / Et3N; DMAP / CH2Cl2 / 6 h / 20 °C 2.1: 9-BBN / tetrahydrofuran / 1.5 h / 28 °C / microwave irradiation 2.2: 37 percent / K3PO4*3H2O; H2O / PdCl2(dppf) / tetrahydrofuran; dimethylformamide / 1 h / 60 °C 3.1: 93 percent / aq. NaOH / methanol / 36 h / 50 °C 4.1: Et3N; 2,4,6-trichlorobenzoyl chloride / tetrahydrofuran / 0.33 h / 20 °C 4.2: 90 percent / DMAP / toluene; tetrahydrofuran / 1 h 5.1: 92 percent / HF*pyridine / tetrahydrofuran View Scheme