Bicyclic isoxazolines are obtained in good yields by the titanium tetrachloride-mediated reaction of allylic stannanes with 1-nitroalkadienes. Titanium tetrachloride converts stannyl nitronates generated in the Michael addition step to nitrile oxide equivalents which, on adding triethylamine, undergo intramolecular 1,3-dipolar cycloaddition to give the isoxazolines.