Copper-mediated regio- and enantio-selective cross-coupling of heterocyclic allyl sulphides with organomagnesium compounds: A case of 1,7-relative stereogenesis
作者:Vincenzo Caló、Angelo Nacci、Vito Fiandanese
DOI:10.1016/0040-4020(96)00601-1
日期:1996.8
Optically active heterocyclic allyl sulphides 1–7 react with organomagnesium compounds in the presence of CuBr to afford optically active alkenes in good yields and very high γ-selectivity. The regioselectivity depends on the solvent as well on the CuBr: allylic sulphide ratio. The heterocyclic nucleus imparts asymmetric induction in the range of 50–98% ee. The regio- and enantio-selectivity of these
光学活性杂环烯丙基硫化物1–7在CuBr存在下与有机镁化合物反应,以良好的收率和非常高的γ选择性提供光学活性烯烃。区域选择性取决于溶剂以及CuBr∶烯丙基硫化物的比率。杂环核的不对称感应范围为ee的50–98%。这些反应的区域和对映选择性与杂环氮对铜有机基的配位作用有关。