(S)-5-benzyl-6,6-dimethyl-2-phenyl-5,6-dihydrooxazolo[2,3-c][1,2,4]triazol-2-ium tetrafluoroborate; potassium hexamethylsilazane in toluene T=-20°C; Asymmetric Steglich rearrangement; optical yield given as percent eeenantioselective reaction;

1,8-diazabicyclo[5.4.0]undec-7-ene in dichloromethane T=20 - 25°C; 1 h;

<b>Multi-step reaction with 2 steps<br /> </b>1: 0.917 g / Ac₂O / 0.5 h / 65 &deg;C<br />2: 0.223 g / Et₃N / tetrahydrofuran / 2 h / 0 &deg;C<br /> <br /> &nbsp;