A Bulky Chiral N‐Heterocyclic Carbene Nickel Catalyst Enables Enantioselective C−H Functionalizations of Indoles and Pyrroles
作者:Johannes Diesel、Daria Grosheva、Shota Kodama、Nicolai Cramer
DOI:10.1002/anie.201904774
日期:2019.8.5
An enantioselective nickel(0)‐catalyzed C−H functionalization of indoles and pyrroles that does not require the typical Lewis basic directing groups is disclosed. The reaction provides access to valuable tetrahydropyridoindoles and tetrahydroindolizines in high yields and enantioselectivity under mild reaction conditions. The process is characterized by a clear endo‐cyclization preference to yield
公开了对映体选择性镍(0)催化的吲哚和吡咯的CH官能化,不需要典型的Lewis碱性指导基团。该反应提供了在温和的反应条件下高收率和对映选择性的有价值的四氢吡啶并吲哚和四氢吲哚并。该方法的特征在于通过一个明确的内切-cyclization偏好以得到所寻求的六元环的产品。环化中活化和选择性成功的关键是开发具有巨大侧翼基团的新型手性SIPr卡宾配体类似物。