A highly enantioselectiveNHinsertionreaction of α‐diazoketones was developed by using cooperative catalysis by dirhodium(II) carboxylates and chiral spiro phosphoric acids. The insertionreaction provides a new access route to diverse chiral α‐aminoketones, which are versatile building blocks in organic synthesis, with fast reaction rates, good yields and high enantioselectivity under mild and