Synthesis of CF3-bearing pyrrolidines by hydrogenation of trifluoroacetylated pyrrole derivatives
作者:Radomyr V. Smaliy、Aleksandra A. Chaykovskaya、Nataliya A. Shtil、Sergey A. Yurchenko、Aleksandr A. Yurchenko、Aleksandr I. Lakhtadyr、Alina O. Gorlova、Aleksandr N. Kostyuk
DOI:10.1016/j.jfluchem.2015.09.017
日期:2015.12
Trifluoroacylated pyrroles and related compounds can be transformed to CF3-bearing pyrrolidines via a Pd/C-mediated hydrogenation under acidic conditions in high yields. The synthesis of several compounds of this type was considerably simplified as compared to formerly available procedures. Stereochemical aspects of the hydrogenation were studied and methods for both preparation and separation of diastereomerically
Synthesis and utilization of trifluoromethylated amino alcohol ligands for the enantioselective Reformatsky reaction and addition of diethylzinc to N-(diphenylphosphinoyl)imine
作者:Xiu-Hua Xu、Xiao-Long Qiu、Feng-Ling Qing
DOI:10.1016/j.tet.2008.05.043
日期:2008.7
successfully applied in the enantioselective Reformatskyreaction and addition of diethylzinc to N-(diphenylphosphinoyl)imine, respectively. The influence of the substituents on C-3 position and the amino moiety on the enantioselectivity has been carefully investigated. In the best cases, ligand 1b exhibited good selectivity for the enantioselective Reformatskyreaction in 86% ee and ligand 12d provided excellent
Asymmetric Synthesis of (α<i>R</i>)-Polyfluoroalkylated Prolinols Based on the Perfluoroalkyl-Induced Highly Stereoselective Reduction of Perfluoroalkyl <i>N</i>-Boc-pyrrolidyl Ketones
Reduction of the obtained chiral (S)-tert-butyl 2-(perfluoroalkanoyl)pyrrolidine-1-carboxylate with sodium borohydride or lithium aluminum hydride proceeded smoothly to give the corresponding (S)-tert-butyl 2-((R)-perfluoro-1-hydroxyalkyl)pyrrolidine-1-carboxylate in yields of 73−97% with excellent diastereoselectivities (up to >98% de), compared with the reduction of nonfluorinated (S)-tert-butyl