1,3-ASYMMETRIC INDUCTION IN THE ALDOL ADDITION-REACTIONS OF METHYL KETONE ENOLATES AND ENOLSILANES TO BETA-SUBSTITUTED ALDEHYDES - A MODEL FOR CHIRALITY TRANSFER
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作者:
EVANS, DA
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机构:Department of Chemistry, Harvard University, Cambridge
EVANS, DA
DUFFY, JL
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机构:Department of Chemistry, Harvard University, Cambridge
DUFFY, JL
DART, MJ
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机构:Department of Chemistry, Harvard University, Cambridge
DART, MJ
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[1] Department of Chemistry, Harvard University, Cambridge
The direction and degree of 1,3-asymmetric induction have been evaluated in the addition of metal enolates and enolsilanes to aldehydes substituted at the beta position with both polar (OR, OAc, Cl) and nonpolar (Me) substituents. A model for 1,3-asymmetric induction for polar addition processes such as the Mukaiyama aldol reaction is proposed to account for the documented trends in reaction diastereoselection for polar beta-substituents.