Iron‐Catalyzed
<i>ortho</i>
C−H Arylation and Methylation of Pivalophenone N−H Imines
作者:Wengang Xu、Naohiko Yoshikai
DOI:10.1002/cssc.201900164
日期:2019.7.5
Iron‐catalyzed ortho C−H arylation and methylation reactions of pivalophenone N−H imines are reported. The pivaloyl N−H imine proved an excellent directing group for the arylation with diarylzinc reagents in the presence of an iron‐diphosphine catalyst and 2,3‐dichlorobutane at room temperature. A similar catalytic system also allowed methylation with Me3Al at 70 °C. The pivaloyl imine of the product
Cobalt-Catalyzed Tandem Radical Cyclization/C–C Coupling Initiated by Directed C–H Activation
作者:Qiao Sun、Naohiko Yoshikai
DOI:10.1021/acs.orglett.9b01846
日期:2019.7.5
A cobalt–N-heterocyclic carbene catalyst promotes a tandem radical cyclization/C–Ccoupling reaction between tosylamide-tethered bromo-alkenes and aryl N–H imines initiated by chelation-assisted arene C–Hactivation, affording 3-(arylmethyl)pyrrolidine derivatives in moderate to good yields. The reaction tolerates a variety of substituents on the aryl imine as well as various modifications on the bromo-alkene