Photocycloaddition, methylation, and catalytic reduction of chiral spirocyclic 1,3-dioxin-4-ones: Different stereofacial selectivity and its explanation.

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Abstract
We describe several reactions of chiral spirocyclic 1, 3-dioxinones, all of which proceed in high stereofacial selectivity. A possible reason for the different selectivities in these reactions is proposed.