The unique reactivity of allenes has led to their emergence as valuable coupling partners
in transition-metal-mediated C–H activation reactions. On the other hand, due to its
high abundance and high Lewis acidity, cobalt is garnering widespread interest as
a useful catalyst for C–H activation. Here, we summarize cobalt-catalyzed C–H activations
involving allenes as coupling partners and then describe our studies on Co(III)-catalyzed
C-8 dienylation of quinoline N-oxides with allenes bearing a leaving group at the α-position for realizing a dienylation
protocol.
Key words
cobalt catalysis - C–H activation - allenes - dienylation - quinolines