Preparation of (1R,1′R)-1,1′-(anthracene-9,10-diyl)bis(2,2,2-trifluoroethanamine): a chiral diamine with low basicity
作者:Carla Estivill、Julen Mendizabal、Albert Virgili、Eva Monteagudo、Teresa Flor、Francisco Sánchez-Ferrando、Angel Alvarez-Larena、Juan F. Piniella
DOI:10.1016/j.tet.2008.10.082
日期:2009.1
A new chiral diamine with low basicity was synthesized in enantiopure form. (1R,1'R)-1,1'-(Anthracene-9,10-diyl)bis(2,2,2-trifluoroethanamine) was obtained by means of several stereochemically controlled reactions. The structures of the title compound and several intermediates were studied. (C) 2008 Elsevier Ltd. All rights reserved.
Bifunctional Thioureas with α-Trifluoromethyl or Methyl Groups: Comparison of Catalytic Performance in Michael Additions
作者:Eddy I. Jiménez、Wilmer E. Vallejo Narváez、Carlos A. Román-Chavarría、Josue Vazquez-Chavez、Tomás Rocha-Rinza、Marcos Hernández-Rodríguez
DOI:10.1021/acs.joc.6b01063
日期:2016.9.2
Thioureas are an important scaffold in organocatalysis because of their ability to form hydrogen bonds that activate substrates and fix them in a defined position, which allows a given reaction to occur. Structures that enhance the acidity of the thiourea are usually used to increase the hydrogen-bonding properties, such as 3,5-bis(trifluoromethyl)phenyl and boronate ureas. Herein, we report the synthesis