The generation of difluoroenolates from trifluoroethanol and reproducible syntheses of α,α-difluoro-β-hydroxy ketones
作者:Andrew S. Balnaves、Thomas Gelbrich、Michael B. Hursthouse、Mark E. Light、Michael J. Palmer、Jonathan M. Percy
DOI:10.1039/a902966d
日期:——
Metallated difluoroenol carbamate 1 reacted with aldehydes and ketones in the presence of highly oxophilic Lewis acid boron trifluorideâethyl ether; the Lewis acid attenuated the transacylation reaction to the corresponding enolates so that allylic alcohols could be isolated. Treatment of the allylic alcohols with strong base afforded difluoroenolates which could be trapped cleanly in aldol reactions.