Three enantiopure fluorous thioureas featuring a free –NH2 group were synthesized by direct addition of aromatic isothiocyanates bearing a single n-C8F17 substituent in the ortho, meta and para position, respectively, to enantiopure (1R,2R)-1,2-diaminocyclohexane. The catalytic behavior of these bifunctional molecules was assessed in representative Michael-type reactions. The three fluorous thioureas performed similarly in all the reactions tested, thus showing that the position of the fluorous ponytail does not have a major influence on the catalytic behavior of this class of compounds. In particular, excellent enantioselectivities (up to 99% ee) and yields (up to 98%) were obtained for the addition of aliphatic aldehydes to maleimides to give α-substituted succinimides. Recyclability of these primary amine-based thioureas was found to be limited by the concurrent formation of imine-derivatives during the catalytic process, leading to a structural modification of the organic catalyst.
Benign Perfluoroalkylation of Aniline Derivatives through Photoredox Organocatalysis under Visible-Light Irradiation
作者:Sebastián Barata-Vallejo、Damian E. Yerien、Al Postigo
DOI:10.1002/ejoc.201501189
日期:2015.12
Fil: Barata Vallejo, Sebastian. Universidad de Buenos Aires. Facultad de Farmacia y Bioquimica. Departamento de Quimica Organica; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas; Argentina
菲尔:巴拉塔瓦列霍,塞巴斯蒂安。布宜诺斯艾利斯大学。Facultad de Farmacia y Bioquimica。Departamento de Quimica Organica; 阿根廷。Consejo Nacional de Investigaciones Cientificas y Tecnicas;阿根廷
Direct perfluoroalkylation of functionalized benzenes with perfluoroalkyl halides and copper bronze
作者:Takamasa Fuchikami、Iwao Ojima
DOI:10.1016/s0022-1139(00)81229-4
日期:1983.6
Tordeux, Marc; Langlois, Bernard; Wakselman, Claude, Journal of the Chemical Society. Perkin transactions I, 1990, # 8, p. 2293 - 2299
作者:Tordeux, Marc、Langlois, Bernard、Wakselman, Claude
DOI:——
日期:——
FUNCHIKAMI, TAKAMASA;OJIMA, IWAO, J. FLUOR. CHEM., 1983, 22, N 6, 541-556