Tandem superelectrophilic hydroarylation of C C bond and carbonyl reduction in cinnamides: synthetic rout to 3,3-diarylpropylamines, valuable pharmaceuticals
摘要:
Cinnamides ArCH=CHCONRR' in reactions with arenes Ar'H under the action of Bronsted (TfOH, FSO3H) or Lewis (AlBr3) superacids at rt for 1-2 h give C=C bond hydroarylation products ArAr'CHCH2CONRR' in yields of 63-98%. Reduction (LiAlH4/Et2O) of carbonyl group in the latter results in the formation of 3,3-diarylpropylamines ArAr'CHCH2CH2NRR', valuable drugs. The reaction intermediates, superelectrophilic dications ArC+H-CH2C(OH+)NRR', have been characterized by DFT calculations in terms of global electrophilicity index, natural charges, and atomic orbitals contributions. (C) 2014 Elsevier Ltd. All rights reserved.
One-pot tandem hydrophenylation and ionic hydrogenation of 3-phenylpropynoic acid derivatives under superelectrophilic activation
作者:Denis I. Nilov、Aleksander V. Vasilyev
DOI:10.1016/j.tetlet.2015.09.026
日期:2015.10
The reactions of esters and amides of 3-phenylpropynoic acid with strong Lewis acids AIX(3) (X = Cl, Br) or conjugate Bronsted-Lewis superacids HX-AIX(3) (X = Cl, Br) in benzene and cyclohexane at room temperature afforded 3,3-diphenylpropanoic acid derivatives in up to 94% yield. This tandem reaction of the acetylene bond proceeded by hydrophenylation followed by ionic hydrogenation. (C) 2015 Published by Elsevier Ltd.
Dicationic Intermediates Involving Protonated Amides: Dual Modes of Reactivity Including the Acylation of Arenes
作者:Douglas A. Klumpp、Rendy、Yun Zhang、Alma Gomez、Aaron McElrea
DOI:10.1021/ol049512z
日期:2004.5.1
In the Bronsted superacid CF3SO3H (triflic acid), amides are able to form reactive, dicationic electrophiles. It is shown that these dicationic intermediates participate in two distinctly different types of electrophilic reactions. The protonated amide increases the reactivity of an adjacent electrophilic group, and the protonated amide group itself shows enhanced reactivity arising from an adjacent cationic charge. In the latter case, several types of amides are even capable of reacting with benzene by Friedel-Crafts acylation.