1: TBHP; D-(-)-diisopropyl tartrate; Ti(OiPr)4 / molecular sieves 3 Angstroem / CH2Cl2 / 3 h / -20 °C 2: 3.62 g / Et3N / CH2Cl2 / 1 h / 0 °C View Scheme

triethylamine in dichloromethane T=0°C; 1 h;