A synthesis of highly substituted aromatics through regiocontrolled construction of cyclobutenones bearing unsaturated substituents at the 4-position

Article abstract of DOI:10.1021/ja00030a043

2,3-Substituted 4-chloro-2-cyclobutenones, prepared by regiospecific transformations of substituted cyclobutenediones, undergo palladium-catalyzed cross-coupling with vinyl- and arylstannanes and vinylzirconium reagents to form 4-R_unsat-2-cyclo