1.1: 84 percent / TsOH / benzene / 4 h / Heating 2.1: aq. KOH / ethanol / 12 h / Heating 3.1: aq. NaOH / dioxane / 12 h / 20 °C 4.1: CO(Im)2; MgCl2; Et3N / tetrahydrofuran / 24 h / 20 °C 5.1: 75 percent / NaH / dimethylformamide / 3 h / 20 °C 6.1: anisole / trifluoroacetic acid / 0.5 h / 0 °C 7.1: Et3N; DMAP / benzene / 1 h / 20 °C 8.1: 71 percent / EtONa / ethanol / 1 h / Heating 9.1: 87 percent / DDQ / dioxane / 4 h / Heating 10.1: 81 percent / NaOH / ethanol / 6 h / 0 °C 11.1: ethyl chloroformate; Et3N / tetrahydrofuran / 0.5 h / 0 °C 11.2: 70 percent / tetrahydrofuran / 1 h / 20 °C 12.1: 55 percent / LiBH4 / dioxane / 0.5 h / 20 °C 13.1: 60 percent / aq. HCl / 0.5 h / Heating 14.1: 64 percent / morpholine / toluene / 3 h / Heating 15.1: [(CH3)3Si]2NLi / tetrahydrofuran / 0.5 h / -78 °C 15.2: 53 percent / (2R,8aS)-(+)-(camphorylsulfonyl)oxaziridine / tetrahydrofuran / 3 h / -78 °C View Scheme