Stereochemical and electronic features of the [3 + 2] cycloaddition of pentafulvenes with acylnitrones
Abstract
A series of mono- and di-substituted pentafulvenes 1–3 was reacted with aroylnitrones 4 to afford the corresponding fused bicyclic monoadducts 5–9, generally as a mixture of isomers. The stereochemistry of the addition reaction was established by 1D and 2D NMR spectroscopies or