Used as a chiral catalyst in asymmetric synthesis, particularly in enantioselective C–H functionalization reactions. It enables high stereoselectivity in the transformation of prochiral C–H bonds into carbon–carbon or carbon–heteroatom bonds, making it valuable in the synthesis of complex organic molecules such as pharmaceuticals and natural products. Its robust structure allows for efficient catalytic performance under mild conditions, often with low catalyst loading. Commonly applied in intramolecular reactions like cyclizations and intermolecular insertions involving diazo compounds.