1,3-ASYMMETRIC INDUCTION IN THE ALDOL ADDITION-REACTIONS OF METHYL KETONE ENOLATES AND ENOLSILANES TO BETA-SUBSTITUTED ALDEHYDES - A MODEL FOR CHIRALITY TRANSFER
Da. Evans et al., 1,3-ASYMMETRIC INDUCTION IN THE ALDOL ADDITION-REACTIONS OF METHYL KETONE ENOLATES AND ENOLSILANES TO BETA-SUBSTITUTED ALDEHYDES - A MODEL FOR CHIRALITY TRANSFER, Tetrahedron letters, 35(46), 1994, pp. 8537-8540
The direction and degree of 1,3-asymmetric induction have been evaluat
ed in the addition of metal enolates and enolsilanes to aldehydes subs
tituted at the beta position with both polar (OR, OAc, Cl) and nonpola
r (Me) substituents. A model for 1,3-asymmetric induction for polar ad
dition processes such as the Mukaiyama aldol reaction is proposed to a
ccount for the documented trends in reaction diastereoselection for po
lar beta-substituents.