Nickel-Catalyzed Cyclization of Difluoro-Substituted 1,6-Enynes with Organozinc Reagents through the Stereoselective Activation of CF Bonds: Synthesis of Bicyclo[3.2.0]heptene Derivatives
a gem: A nickel‐catalyzed cyclization of 1,6‐enynes, bearing a gem‐difluoro group at the olefinic terminus, with organozinc reagents gives the title compounds (see scheme). One of the fluorineatoms is stereoselectively replaced by the R′ group of R′2Zn, indicating the involvement of the stereoselective activation of a C–F bond.