In Situ Generation of Vinyl Allenes and Its Applications to One-Pot Assembly of Cyclohexene, Cyclooctadiene, 3,7-Nonadienone, and Bicyclo[6.4.0]dodecene Derivatives with Palladium-Catalyzed Multicomponent Reactions
作者:Phil Ho Lee、Kooyeon Lee、Youngjin Kang
DOI:10.1021/ja054144v
日期:2006.2.1
reaction of vinyl triflate with allenylindium followed by Pd-catalyzed carbon monoxide insertion reaction gave the corresponding 3,7-nonadienone product via tandemPd-catalyzedcross-coupling and [4 + 4 + 1] annulation. TandemPd-catalyzedcross-coupling, [4 + 4] cycloaddition, and [4 + 2] cycloaddition provided the rapid synthesis of bicyclo[6.4.0]dodecene derivatives starting from alpha-bromovinyl arenes
A palladium catalyst serves as a template for the assembly of a nine-memberedcarbocycle from two molecules of vinylallene and one molecule of carbon monoxide [Eq. (a)]. This unprecedented [4+4+1] cycloaddition is in marked contrast to the [4+1] cycloaddition mediated by rhodium(I) catalysts.