Trifluoromethylation of enamines under acidic conditions
作者:Roman T. Gritsenko、Vitalij V. Levin、Alexander D. Dilman、Pavel A. Belyakov、Marina I. Struchkova、Vladimir A. Tartakovsky
DOI:10.1016/j.tetlet.2009.03.187
日期:2009.6
A method for the trifluoromethylation of enamines using Me3SiCF3 leading to α-CF3-substituted amines is described. The reaction is promoted by hydrofluoric acid generated from KHF2 and either trifluoroacetic or triflic acid, and involves protonation of the enamine followed by transfer of the CF3-carbanion from the silicon reagent to the cationic electrophile.
Reaction of Arynes with Vinylogous Amides: Nucleophilic Addition to the <i>ortho</i>-Quinodimethide Intermediate
作者:Ran Li、Xuemei Wang、Zhibin Wei、Chunrui Wu、Feng Shi
DOI:10.1021/ol4018968
日期:2013.9.6
The reaction of arynes with vinylogous amides containing no free N-H bonds proceeds in a [2 + 2] cycloaddition fashion at ambient temperature. The electronic properties of the vinylogous amides allow for the cycloadducts undergoing a facile ring-opening process, leading to electronically biased ortho-quinodimethide intermediates. Subsequent nucleophilic addition with alcohols affords 2-substituted benzaldehydes or ketones.