Boron azaenolates 2 and 8 from the optically active chloromethyloxazolines
1 and 7 have been found to couple with ketones in a highly diastereoselecti
ve fashion, which depends markedly upon the geometry (Z) of the azaenolates
and the nature of the ligands which are present on the boron atom, in good
accordance with semiempirical calculations (AM1). (C) 1999 Elsevier Scienc
e Ltd. All rights reserved.