Catalytic Asymmetric Homologation of 4‐Substituted Cyclohexanones with CF
<sub>3</sub>
CHN
<sub>2</sub>
: Enantioselective Synthesis of α
<i>‐</i>
Trifluoromethyl Cycloheptanones
作者:Shu‐Sen Li、Shuo Sun、Jianbo Wang
DOI:10.1002/anie.202115098
日期:2022.2
reaction of cyclic ketones with CF3CHN2 as the trifluoromethylation reagent. This reaction could be applied to construct silicon-stereogenic centers with moderate diastereoselectivities and high enantioselectivities.
Synthesis of Trifluoroethyl-Substituted Ketones from Aldehydes and Cyclohexanones
作者:Bill Morandi、Erick M. Carreira
DOI:10.1002/anie.201103526
日期:2011.9.19
A trifluoromethylated symphony! A new transformation involving trifluoromethyl diazomethane generated in situ has been developed that allows direct access to trifluoroethyl ketone derivatives from aldehyde and cyclohexanone compounds (see scheme).
An unprecedented Pd-catalyzed activation of a CF3 group is reported herein. The key to the success of this reaction is the combination of consecutive β-F elimination and C–Fbond oxidative addition of a trifluoromethyl group. It also represents the first general application of α-trifluoromethyl ketones as building blocks by C–Fbondactivation.