1,5-Asymmetric Induction in Methyl Ketone Aldol Addition Reactions
作者:David A. Evans、Paul J. Coleman、Bernard Côté
DOI:10.1021/jo962417m
日期:1997.2.1
1,3-asymmetric induction in hydride addition reactions to β-substituted ketones. A model for chirality transfer
作者:David A. Evans、Michael J. Dart、Joseph L. Duffy
DOI:10.1016/s0040-4039(00)78431-0
日期:1994.11
We report the 1,3-asymmetric induction observed in the additions of various hydride reagents to beta-substituted ketones. Both the nature of the beta-substituents and the size of the achiral alkyl group attached to the carbonyl moiety have a significant effect on the direction and degree of carbonyl diastereofacial selectivity. A revision of Cram's polar model for 1,3-asymmetric induction is proposed to account for these results.