Nickel-catalyzed regioselective hydrocyanation of terminal alkynes by assistance of a tosyl group
作者:Shigeru Arai、Koichi Nakazawa、Xiao-fei Yang、Atsushi Nishida
DOI:10.1016/j.tet.2019.03.019
日期:2019.4
hydrocyanation of terminal alkynes is described. A tosylamide functionality at the propargyl position was the most suitable group for controlling the regiochemistry for CCN bond formation as well as rate enhancement. A gram-scale synthesis was achieved by minimizing the catalyst loading to 2 mol%. The major HCN adduct could be transformed to the corresponding indoline through construction of a benzylic quaternary
描述了末端炔烃的镍催化的区域选择性氢氰化。炔丙基位置上的甲苯磺酰胺官能团是最合适的基团,用于控制区域化学以形成C CN键以及提高速率。通过将催化剂载量最小化至2mol%来实现克级合成。通过在铁催化下构建苄基季碳,可以将主要的HCN加合物转化为相应的二氢吲哚。