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 cyclic carbopalladation followed by cross coupling, whereas the corresponding reaction of organozincs tends to be dominated by direct cross coupling.
ω-(和- ω-(邻-碘代芳基)的反应-β-iodoalkenyl)炔烃与含有锆,锡,铝,或B中配合物的催化量的钯-膦,如Pd的存在下有机金属化合物( PPh 3)4主要通过初始环状碳钯反应进行,然后进行交叉偶联,而有机锌的相应反应则往往被直接交叉偶联所控制。