1: titanium(IV) isopropylate; tert.-butylhydroperoxide; L-(+)-diisopropyl tartrate / dichloromethane / -20 °C 2: methanesulfonyl chloride; triethylamine / 0 °C / Reflux 3: hydrogenchloride / tetrahydrofuran 4: sodium hydrogencarbonate 5: triethylamine / 0 °C 6: sodium hydride / N,N-dimethyl-formamide 7: hydrogenchloride / methanol View Scheme