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The use of iminopyridines as efficient ligands in the palladium(II)-catalyzed cyclization of (Z)-4′-acetoxy-2′-butenyl 2-alkynoates

Juan Song - No affiliation found

2007/06/11 Full-length article DOI: 10.1016/j.tet.2007.04.006 Journal: Tetrahedron

Abstract:

AbstractIminopyridines were found to be a sort of efficient bidentate ligands for the palladium(II)-catalyzed cyclization of (Z)-4′-acetoxy-2′-butenyl 2-alkynoates in acetic acid to afford the α-(Z)-acetoxyalkylidene-β-vinyl-γ-butyrolactones. The iminopyridine ligands could not only inhibit β-hydride elimination but also stabilize the vinyl-palladium intermediate in acetic acid in the reaction.