Palladium-catalyzed enyne–yne [4+2] benzannulation as a new and general approach to polysubstituted benzenes
作者:Vladimir Gevorgyan、Yoshinori Yamamoto
DOI:10.1016/s0022-328x(98)01061-4
日期:1999.3
Monosubstituted conjugatedenynes smoothly underwent [4+2] homodimerization in the presence of palladium catalyst to give 4, α- and 2,6-disubstituted styrenes. Analogous cross-cycloaddition of conjugatedenynes and diynes afforded a variety of polysubstituted benzenes, including phenol and aniline derivatives. Alkynes and diynes in the presence of a palladium catalyst underwent novel formal [2+2+2]