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.
Phosphorated 1,2-Oxazabuta-1,3-dienes as Synthetic Tools for the Preparation of <i>α</i>-Amino Phosphorus Derivatives and Functionalized Nitrogen-Containing Heterocycles
作者:Jesús M. de los Santos、Roberto Ignacio、Domitila Aparicio、Francisco Palacios
DOI:10.1080/10426507.2010.522632
日期:2011.3.31
Abstract An efficient method for the synthesis of phosphorated 1,2-oxazabuta-1,3-dienes derived from phosphine oxides and phosphonates has been developed by means of base-mediated dehydrohalogenation of readily available α-halooximes. New functionalized α-amino phosphorus derivatives are easily available, in a regioselective way, through conjugate addition of amino nucleophilic reagents such as ammonia