Accelerated transmetallation in Stille couplings effected by chelation to the palladium
作者:Geoffrey T. Crisp、Markus G. Gebauer
DOI:10.1016/0040-4039(95)00489-y
日期:1995.5
The relative reactivities of vinylstannanes 2a,b and 4a,b in a Stille coupling with vinyl bromide were studied under a variety of conditions. Vinyl bromide coupled with the sterically hindered vinylstannane 2a preferentially compared to the less hindered stannane 2b when PdCl2(CH3CN)(2) was employed as a catalyst. Coordination of the nitrogen of the imine protecting group to the palladium is proposed to account for this rate acceleration.
Palladium-catalyzed synthesis of dienic α-amino acids from allenes
作者:Nina Kopola、Béatrice Friess、Bernard Cazes、Jacques Gore
DOI:10.1016/s0040-4039(00)99295-5
日期:1989.1
1,3-Dienic or styryl α-amino acid precursors and are easily obtained through the catalytic carbopalladation of allenes followed by the trapping of the intermediate π-allyl complex with either the anion of Schiff base or of acetamidomalonate .