Kiyoshi Tomioka, Mostafa Ahmed Hussein, Takeshi Kambara, Hiroki Fujieda, Satoko Hayashi, Yumiko Nomura, Motomu Kanai and Kenji Koga
An external chiral tridentate amino diether ligand 7 catalyzed the condensation reaction of a lithium ester enolate 2 with an imine 3 to give the enantiomerically enriched β-lactam 4 in high yield.