Highly enantioselective hetero Diels–Alder reactions of N-sulfinyl dienophiles promoted by copper(II)- and zinc(II)-chiral bis(oxazoline) complexes
作者:Annette Bayer、Odd R. Gautun
DOI:10.1016/s0957-4166(01)00525-0
日期:2001.11
Hetero Diels-Alder reactions of 1,3-cyclohexadiene with N-sulfinyl dienophiles 1a or 1b, promoted by Cu(II)- or Zn(II)-chiral bis(oxazoline) complexes, afforded endo adducts in high yields (up to 85%) and enantiomeric excess (e.e. of up to >98%) under stoichiometric conditions. With 10 mol% loading of the Zn(II) catalyst up to 75% e.e. was obtained for the endo adduct (endo:exo=10:1, total yield 68%). (C) 2002 Elsevier Science Ltd. All rights reserved.