Catalytic Asymmetric Intra- and Intermolecular Haloetherification of Enones: An Efficient Approach to (−)-Centrolobine
作者:Pengfei Zhou、Yunfei Cai、Xia Zhong、Weiwei Luo、Tengfei Kang、Jun Li、Xiaohua Liu、Lili Lin、Xiaoming Feng
DOI:10.1021/acscatal.6b02048
日期:2016.11.4
alkenes (halogen = Cl, Br, I) has been realized by the use of chiral metal complexes of N,N′-dioxides. In the presence of a chiral Fe(III) complex, a series of tetrahydropyran derivatives were obtained in good yields (up to 99% yield) with a high level of enantioselectivities (up to 97% ee). Promoted by a chiral Ce(III) complex, chiral oxepane derivatives could be given in good results. Moreover, the
缺电子烯烃(卤素= Cl,Br,I)的催化不对称分子内和分子间卤代醚化反应已通过使用N,N'-二氧化物的手性金属配合物实现。在手性Fe(III)络合物的存在下,以良好的收率(最高99%的收率)和高的对映选择性(最高97%ee)获得了一系列四氢吡喃衍生物。在手性Ce(III)配合物的促进下,手性氧杂环丁烷衍生物可以得到很好的结果。而且,证明了使用MeOH作为亲核试剂,由Sc(III)配合物催化的查耳酮的分子间卤醚化。该方法也可以成功地应用于(-)-Centrolobine的合成。同时,提出了合理的反应机理。