C−H Silylation of 2‐Arylpyridine Derivatives by Using Iridium Catalyst and Phosphine‐Borane Ligand

Iridium‐catalyzed ortho−C−H silylation of 2‐arylpyridine derivative with hydrosilane by using phosphine‐borane ligand has been developed. A variety of 2‐arylpyridines could be used for this reaction to give mono‐ and disilylated products in 81–99% yields. In this reaction, the length of linkage between phosphorus and boron plays an important role for the reaction to proceed. We consider that the nitrogen in 2‐arylpyridine coordinates to Lewis acidic boron in the ligand and thus the iridium is led to an ortho−C−H bond to cleave it.