Asymmetric Au-catalyzed domino cyclization/nucleophile addition reactions of enynes in the presence of water, methanol and electron-rich aromatic derivatives
作者:Alexandre Pradal、Chung-Meng Chao、Maxime R. Vitale、Patrick Y. Toullec、Véronique Michelet
DOI:10.1016/j.tet.2011.03.071
日期:2011.6
system is described for the asymmetric domino cyclization/functionalization reactions of functionalized 1,6-enynes in the presence of an external nucleophile. The use of (R)-4-MeO-3,5-(t-Bu)2-MeOBIHEP ligand associated with gold led to clean rearrangements implying the formal addition of an oxygen or carbon nucleophile to an alkene followed by a cyclization process. The enantiomeric excesses were highly
描述了一种有效的Au(I)催化体系,用于在外部亲核试剂存在下官能化1,6-烯炔的不对称多米诺环化/官能化反应。与金缔合的(R)-4-MeO-3,5-(t - Bu)2 -MeOBIHEP配体的使用导致干净的重排,这意味着将氧或碳亲核体正式加成至烯烃,然后进行环化过程。对映体过量高度依赖于底物/亲核试剂的组合。在带有较大基团的基团(受阻的二酯和二砜)和受阻碳亲核试剂的情况下,可以获得很好的对映体过量,最高可达98%。