Synthesis of polycyclic ketones via carbonylative cyclization of organopalladium compounds derived from norbornene and norbornadiene
作者:Richard C. Larock、Kentaro Takagi、Joseph P. Burkhart、Susan S. Hershberger
DOI:10.1016/s0040-4020(01)87528-1
日期:1986.1
The bicyclic and tricyclic organopalladium compounds prepared via π-allyl- and vinylpalladium additions to norbornene and norbornadiene respectively undergo cyclization upon reaction with carbon monoxide in methanol to afford an interesting variety of polycyclic ketones. The nature of the ligand on palladium (chloride versus hexafluoroacetylacetonate) and the presence or absence of triethylamine is
[RuCl2(CO)3]2/Et3N and (eta 3-C3H5)RuBr(CO)3/Et3N are highly effective catalyst systems for carbonylative cyclization of allylic carbonates with alkenes to give the corresponding cyclopentenones in high yields. For example, treatment of allyl methyl carbonate (1a) with 2-norbornene (2a) in the presence of a catalytic amount of [RuCl2(CO)3]2 (2.5 mol %) and Et3N (10 mol %) at 120 degrees C for 5 h under