1: 98 percent / 1.) pyridine, OsO4, 2.) H2S / 1.) THF, rt, overnight, 2.) MeOH, 30 min 2: 96 percent / amberlyst-15 resin / methanol / 48 h / Ambient temperature View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: L-(-)-diisopropyltartrate, Ti(oPri)4, t-BuO₂H<br />2: 48 percent / titanium(IV)isopropoxide / tetrahydrofuran / 1.5 h / Ambient temperature<br /> <br /> &nbsp;