1: 49 percent / zinc; acetic acid / ethyl acetate / 18 h / 20 °C 2: 70 percent / tetrabutylammonium fluoride / tetrahydrofuran / 2 h / 20 °C View Scheme

1: With sec.-butyllithium in tetrahydrofuran; cyclohexane T=-78°C; 0.5 h; 2: With (R)-camphorsulfonyl oxaziridine in tetrahydrofuran; cyclohexane T=-78°C; 0.416667 h; Further stages.;

1.1: sodium hydride / tetrahydrofuran; hexane / 0.25 h / 0 °C 1.2: 93.5 percent / tetrahydrofuran; hexane / 18 h / 80 °C 2.1: sec-butyllithium / tetrahydrofuran; cyclohexane / 0.5 h / -78 °C 2.2: 65 percent / (R)-camphorsulfonyl oxaziridine / tetrahydrofuran; cyclohexane / 0.42 h / -78 °C View Scheme

1.1: sodium hydride / tetrahydrofuran; hexane / 0.25 h / 0 °C 1.2: 93.5 percent / tetrahydrofuran; hexane / 18 h / 80 °C 2.1: sec-butyllithium / tetrahydrofuran; cyclohexane / 0.5 h / -78 °C 2.2: 65 percent / (R)-camphorsulfonyl oxaziridine / tetrahydrofuran; cyclohexane / 0.42 h / -78 °C View Scheme

acetic acid; zinc in ethyl acetate T=20°C; 18 h;