Palladium(II)-Catalyzed Asymmetric Cyclization of (<i>Z</i>)-4‘-Acetoxy-2‘-butenyl 2-Alkynoates. Role of Nitrogen-Containing Ligands in Palladium(II)-Mediated Reactions
作者:Qinghai Zhang、Xiyan Lu、Xiuling Han
DOI:10.1021/jo0105181
日期:2001.11.1
2'-bipyridine) catalyzed the cyclization of (Z)-4'-acetoxy-2'-butenyl 2-alkynoates (1) in acetic acid to afford the alpha-(Z)-acetoxyalkylidene-beta-vinyl-gamma-butyrolactones (2) with high efficiency and high stereoselectivity. The nitrogen-containing ligands, like halides, served to favor beta-heteroatom elimination over beta-hydride elimination in Pd(II)-mediated reactions. The generality of this