1: 98 percent / H2O2 / 2,2,2-trifluoro-ethanol / 20 h / 20 °C 2: SO2Cl2 / diethyl ether / -78 - 20 °C View Scheme

silver tetrafluoroborate; 4 A molecular sieve in dichloromethane T=0°C; 1 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

(3'S,2R)-(-)-N-(phenylsulfonyl)-(3,3-dichlorocamphoryl)oxaziridine in tetrachloromethane 50 h; Ambient temperature; Yield given. Yields of byproduct given. Title compound not separated from byproducts;