1: 92 percent / pyridinium p-toluenesulfonate / CH2Cl2 / 16 h / Ambient temperature 2: CH(NMe2)3 / 1 h / 100 °C 3: 2N HCl / tetrahydrofuran / 20 h / Ambient temperature 4: PCC / CH2Cl2 / 5 h / Ambient temperature 5: CH2Cl2 / 0.33 h / Ambient temperature 6: DBN / CH2Cl2 / 6 h / Ambient temperature 7: K2CO3, MeOH / 5 h / Ambient temperature 8: 1N HCl / tetrahydrofuran / 12 h / Ambient temperature 9: 49 percent / pyridine / 12 h / -20 °C 10: 73 percent / PCC / CH2Cl2 / 2 h / Ambient temperature View Scheme

1: 92 percent / pyridinium p-toluenesulfonate / CH2Cl2 / 16 h / Ambient temperature 2: CH(NMe2)3 / 1 h / 100 °C 3: 2N HCl / tetrahydrofuran / 20 h / Ambient temperature 4: PCC / CH2Cl2 / 5 h / Ambient temperature 5: CH2Cl2 / 0.33 h / Ambient temperature 6: DBN / CH2Cl2 / 6 h / Ambient temperature 7: K2CO3, MeOH / 5 h / Ambient temperature 8: 1N HCl / tetrahydrofuran / 12 h / Ambient temperature 9: 49 percent / pyridine / 12 h / -20 °C View Scheme