Nickel-Catalyzed Highly Regio- and Stereoselective Three-Component Assembly of Allenes, Aryl Iodides, and Alkenylzirconium Reagents
作者:Ming-Si Wu、Dinesh Kumar Rayabarapu、Chien-Hong Cheng
DOI:10.1021/ja037718+
日期:2003.10.1
the three-component assembling reaction to furnish the corresponding 1,4-diene derivatives in good yields. Several alkenylzirconium reagents (R2CH=CHZr(Cp)2Cl: R2 = Ph (3b), t-Bu, TMS) were also employed for this three-component assembly. The nickel-catalyzed three-component assembly was further extended to vinyl iodides. Thus, 1a reacts with 3b and ethyl (Z)-3-iodoacrylate to produce a highly substituted
环己基丙二烯 (1a) 和链烯基锆试剂 (n-PrCH=CHZr(Cp)2Cl) 与各种芳香族碘化物 (R1-I: R1 = 4-PhOMe, 4-PhCOMe, 4-PhMe, 2-噻吩、2-PhOMe、3-PhOMe 和 4-PhCO2Et)在 NiCl2(PPh3)2 和锌粉的 THF 中,在 50 摄氏度下,以中等至良好的产率提供相应的三组分组装产品,并具有非常高的区域- 和立体选择性。除了环己基丙二烯外,苯丙二烯、正丁基丙二烯、环戊基丙二烯和环庚基丙二烯也进行了三组分组装反应,以良好的收率提供了相应的1,4-二烯衍生物。几种链烯基锆试剂(R2CH=CHZr(Cp)2Cl:R2=Ph (3b)、t-Bu、TMS)也用于这种三组分组装。镍催化的三组分组件进一步扩展到乙烯基碘。因此,1a 与 3b 和 (Z)-3-碘代丙烯酸乙酯反应以优异的产率产生高度取代的三烯。在所有这些三组分组装反应中,E