Alkenyl, allyl, and alkynylstannanes react with perfluoroalkyliodides in the presence of a catalytic amount of Pd(PPh3)4 to give alkenes and alkynes bearing perfluoroalkyl group.
Allyl stannanes as electrophiles or nucleophiles in the palladium-catalyzed reactions with alkynes
作者:Belén Martı́n-Matute、Elena Buñuel、Marı́a Méndez、Cristina Nieto-Oberhuber、Diego J Cárdenas、Antonio M Echavarren
DOI:10.1016/j.jorganchem.2003.07.027
日期:2003.12
The reactivity of the allylstannanes can be inverted by changing the oxidation state of the catalyst from Pd(II) to Pd(0). Whereas with Pd(II) an anti nucleophilic attack of the allylstannane on the alkyne takes place, the reaction with Pd(0) proceeds by oxidative addition to form (η3-allyl)palladium complexes leading to a formal syn addition to the alkyne. This mechanistic proposal is supported