a cationic rhodium(I)/Solphos complex-catalyzed asymmetric one-pot transesterification and [2 + 2 + 2] cycloaddition of 1,6-diyne esters with tertiary propargylic alcohols leading to enantioenriched tricyclic 3,3-disubstituted phthalides. The present method represents a versatile new route to the synthesis of enantioenriched tricyclic 3,3-disubstituted phthalides in view of the easy access to both coupling
The diastereoselective [2,3]-Wittig rearrangement of a tertiary bisallylic ether (8) is described. The stereochemical outcomes for rearranged products were determined. The effects of reaction conditions on selectivities were investigated. Matsuccocus female sex pheromones 1–3 were efficiently synthesized via this rearrangement.