Diastereoselective construction of structurally diverse polycyclic spiroindolenines via Yb(OTf) 3 -catalyzed cascade [1,5]-hydride transfer/cyclization

A Yb(OTf) 3 -catalyzed [1,5]-hydride transfer/cyclization between indolin-2-imines and 2-amino-substituted benzaldehydes has been disclosed for convenient preparation of polycyclic spiroindolenines in good to excellent yields with excellent diastereoselectivities.