1: 80 percent / mCPBA; H2SO4 / methanol; CH2Cl2 / 0 °C 2: 77 percent / NaBH4 / tetrahydrofuran / 0 °C 3: 100 percent / H2 / Pd/C / tetrahydrofuran / 20 °C View Scheme

1: 58 percent / NaNO2; aq. H2SO4 / methanol; tetrahydrofuran / 20 °C 2: 100 percent / H2 / Pd/C / tetrahydrofuran / 20 °C View Scheme

1: 58 percent / NaNO2; aq. H2SO4 / methanol; tetrahydrofuran / 20 °C 2: 80 percent / hydroxylamine hydrochloride; pyridine / 80 °C 3: 82 percent / NaOH / ethane-1,2-diol / 0.5 h / 200 °C 4: 100 percent / H2 / Pd/C / tetrahydrofuran / 20 °C View Scheme

1: 80 percent / mCPBA; H2SO4 / methanol; CH2Cl2 / 0 °C 2: 18 percent / NaBH4 / tetrahydrofuran / 0 °C View Scheme

1: With potassium tert-butylate in tert-butyl alcohol T=20°C; 1 h; 2: With isopentyl nitrite in tert-butyl alcohol T=20°C; 5 h;

1: 58 percent / NaNO2; aq. H2SO4 / methanol; tetrahydrofuran / 20 °C 2: 80 percent / hydroxylamine hydrochloride; pyridine / 80 °C 3: 82 percent / NaOH / ethane-1,2-diol / 0.5 h / 200 °C View Scheme

1: 58 percent / NaNO2; aq. H2SO4 / methanol; tetrahydrofuran / 20 °C 2: 78 percent / NaBH4 / tetrahydrofuran / 0 °C View Scheme