Table 2. Reaction scope ^a .

^aReaction scale: oxetane 1 (0.50 mmol), In(OTf)₃ (10 mol%), CH₂Cl₂ (5.0 mL); isolated yield.

^bRun with 5 mol% of In(OTf)₃.

^cRun in DCE solvent at 60 °C.

^dRun with 20 mol% of In(OTf)₃.

^eRun with HNTf₂ (1 equiv.) in place of In(OTf)₃.

^fRun with HCl (2.5 equiv., 4 M solution in MeOH) in place of In(OTf)₃.