Synthesis of 1,3-Dioxin-4-ones and Their Use in Synthesis. 21. Intramolecular Photo[2+2]cycloaddition Reactions of Chiral Spirocyclic Dioxinones Having w-Alkenyl Groups at 3-Position
Synthesis of 1,3-Dioxin-4-ones and Their Use in Synthesis. 21. Intramolecular Photo[2+2]cycloaddition Reactions of Chiral Spirocyclic Dioxinones Having w-Alkenyl Groups at 3-Position