STEREOSELECTIVE ALKYLATIONS IN RIGID SYSTEMS - EFFECT OF REMOTE SUBSTITUENTS ON PI-FACIAL ADDITIONS TO LACTAM ENOLATES - STEREOELECTRONIC AND STERIC EFFECTS
Ai. Meyers et al., STEREOSELECTIVE ALKYLATIONS IN RIGID SYSTEMS - EFFECT OF REMOTE SUBSTITUENTS ON PI-FACIAL ADDITIONS TO LACTAM ENOLATES - STEREOELECTRONIC AND STERIC EFFECTS, Journal of the American Chemical Society, 120(30), 1998, pp. 7429-7438
A series of chiral bicyclic lactams has been studied by both experimen
t and ab initio molecular orbital calculations. The facial selectivity
of the alkylation of their enolates shows a high degree of endo or ex
o entry, depending upon certain substituents and their positions in th
e lactams. The suggested reasons for the exo or endo selectivity for a
lkylation were determined to be purely electronic or purely steric in
certain instances. The results of the selectivity study now allow the
asymmetric synthesis of various ketones, acids, and pyrrolidines in ei
ther enantiomeric form based on the choice of lactam employed.