Convenient Synthesis of Angular Triquinane from 4-Alkenylfulvene via Thermal Cycloaddition Followed by Skeletal Rearrangement of the Resulting [4 + 2] Adduct
Alkenylfulvene prepared by the annulation of allylidenetriphenylphosphorane with 1,4-ynedione proceeded thermal cycloaddition in a highly regio- and stereoselective manner to give [4 + 2] adduct wh...