Synthesis of 2,4-Furanophanes by Palladium-Catalyzed Macrocyclization Reactions of 1,n-Diallenyl Diketones
作者:A. Stephen K. Hashmi、Lothar Schwarz、Michael Bolte
DOI:10.1002/ejoc.200300792
日期:2004.5
The 1,n-diallenyldiketones 8a−j were prepared and subjected to reactions with the [PdCl2(MeCN)2] catalyst. Upon decreasing the length of the bridge between the allenyl ketone units, first we obtained the (E) isomer 10 as the macrocyclic product and then the (Z) isomer 11 accompanied by the exocyclic double bond isomer 12. In all cases, the open-chained 1,n-difuryl alkanes were isolated as side-products