Abstract
The novel and simple synthesis of tricyclic chromenoisoxazolidine frameworks by using Baylis-Hillman derivatives through in situ formation of nitrones followed by an intramolecular [3+2] dipolar cycloaddition reaction sequence is described. The new [3+2] cycloaddition reaction leads to a novel class of angularly substituted fused tricyclic chromenoisoxazolidines, creating two rings and three contiguous stereocenters, one of them being a tetrasubstituted carbon center. Fused tricyclic compounds were obtained in a highly stereoselective fashion with high yields.
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