Abstract
Substituted indenones reacted smoothly with a variety of in situ generated nitrones in the presence of lanthanide triflates to give exclusive exo 1,3-dipolar cycloaddition products in high yield. Judicious choice of the nitrone substituents allowed for further modification of the indenoisoxazolidine core to the corresponding indenoisoxazoline and indenoisoxazole analogs in high yield.
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