1: 1.) (COCl)2, DMSO, 2.) Et3N 3: 2,6-lutidine / CH2Cl2 / 4 h / -50 °C 4: DDQ, H2O / CH2Cl2 / 3 h / 0 °C 5: Dess-Martin periodinane 6: Mo(CHMe2Ph)<N(2,6-(i-Pr)2C6H3)><OCMe(CF3)2>2 / benzene / 4 h / 55 °C 7: 60 percent / HF*pyridine / tetrahydrofuran / 3 h 8: 86 percent / dimethyldioxirane / CH2Cl2 / 4 h / -50 °C View Scheme

1: 1.) (COCl)2, DMSO, 2.) Et3N 3: 2,6-lutidine / CH2Cl2 / 4 h / -50 °C 4: DDQ, H2O / CH2Cl2 / 3 h / 0 °C 5: Dess-Martin periodinane 6: Mo(CHMe2Ph)<N(2,6-(i-Pr)2C6H3)><OCMe(CF3)2>2 / benzene / 4 h / 55 °C 7: 60 percent / HF*pyridine / tetrahydrofuran / 3 h View Scheme