Regioselectivity of the protonation of captodative enamines bearing a CF3 group
摘要:
Capodative enamines bearing a CF3 group are protonated at the N- or beta-C-atom depending on the structure of the initial base and the nature of protonating reagent. (C) 2009 Elsevier B.V. All rights reserved.
Selective synthesis of α-trifluoromethyl-β-aryl enamines or vinylogous guanidinium salts by treatment of β-halo-β-trifluoromethylstyrenes with secondary amines under different conditions
作者:Vasiliy M. Muzalevskiy、Valentine G. Nenajdenko、Alexander Yu. Rulev、Igor A. Ushakov、Galina V. Romanenko、Aleksey V. Shastin、Elizabeth S. Balenkova、Günter Haufe
DOI:10.1016/j.tet.2009.06.048
日期:2009.8
β-halo-β-trifluoromethylstyrenes with secondaryamines under different conditions were discovered. Depending on the electronic properties of the starting styrenes and the reaction parameters, two pathways were found. With neat secondaryamines a series of α-trifluoromethyl-β-aryl enamines were prepared in high yields. In contrast, the reactions of the mentioned styrenes with the same amines in polar solvents by substitution