Metal-promoted cyclization. 25. Palladium-catalyzed cascade carbometalation of alkynes and alkenes as an efficient route to cyclic and polycyclic structures
Effects of organometals on the palladium-catalyzed tandem carbopalladation-cross coupling for preparing stereodefined exocyclic alkenes
作者:Ei-ichi Negishi、Yumiki Noda、Frédéric Lamaty、Edward J. Vawter
DOI:10.1016/s0040-4039(00)97630-5
日期:1990.1
The reaction of ω-(o-iodoaryl)- and ω-(-β-iodoalkenyl)alkynes with organometals containing Zr, Sn, Al, or B in the presence of a catalytic amount of a palladium-phosphine complex, such as Pd(PPh3)4, proceeds predominantly via initial cycliccarbopalladation followed by cross coupling, whereas the corresponding reaction of organozincs tends to be dominated by direct cross coupling.