A new Yb3+-catalyzed pinacol and imine-coupling reaction
摘要:
Ytterbium triflate, Yb(OTf)(3), catalyzes the intermolecular reductive homocouplings of imines, aldehydes, and ketones at loadings of 5 mol % in the Presence of Mg and Me3SiCl to give isolated yields of up to 95%. Diastereoselectivity of up to 4/96 (dl/meso) is achieved for aromatic aldehydes, up to 100% dl for aliphatic aldehydes, and 100% dl for an intramolecular imine coupling. (C) 2010 Elsevier Ltd. All rights reserved.