3,3-Disubstituted prop-2-enoic acids were selectively prepared in good yields under mild experimental conditions via palladium-catalysed cross-coupling of 3-substituted 3-iodobut-2-enoic acids with miscellaneous organometallic reagents using dichlorobis(acetonitrile)palladium(II) as catalyst and DMF as solvent.
The stereoselective synthesis of vinylstannanes bearing car☐ylic acid function was achieved from acetylenic acids via stannylcupration reaction. In homoallylic series, regioselectivities are highly dependant on the nature of stannylanionids and on the protection of the car☐ylic acid function.
(<i>E</i>)-5-(Tributylstannylmethylidene)- 5<i>H</i>-furan-2-ones: Versatile Synthons for the Stereospecific Elaboration of γ-Alkylidenebutenolide Skeletons
[GRAPHICS]Stereoselective construction of (E)-gamma-tributylstannylmethylidene butenolides 1 was achieved through the palladium-catalyzed tandem cross coupling/cyclization reactions of tributylstannyl 3-iodopropenoate derivatives with tributyltinacetylene. Iododestannylation of 1 occurs with inversion of the configuration of the exocyclic double bond while the observed selectivity in the Stille reaction was found to be dependent on the nature of the aryl halide.