Enantioselective Organocatalytic Michael Addition of Aldehydes to Trifluoroethylidene Malonates
作者:Lele Wen、Qilong Shen、Long Lu
DOI:10.1021/ol101894h
日期:2010.10.15
An efficient, highly enantioselective, organocatalyticMichaeladdition reaction of aldehydes with trifluoroethylidene malonates is described. The asymmetric reaction provided highly optically pure β-trifluoromethyl aldehydes which can be conveniently transformed into 4,4,4-trifluoromethyl butyric acid and trifluoromethyl substituted δ-lactones without loss in enantioselectivity.
Enantioselective Organocatalytic Michael Addition of Nitroalkanes and Other Nucleophiles to β-Trifluoromethylated Acrylamides
作者:Lele Wen、Liang Yin、Qilong Shen、Long Lu
DOI:10.1021/cs300806w
日期:2013.4.5
An organocatalytic asymmetric Michael addition of nitroalkanes to trifluoromethylated acrylamides in good yields and with good to excellent diastereoselectivities and excellent enantioselectivities is described. The Michael adducts could be readily transformed into optically pure trifluoromethylated gamma-aminobutyric acid 7 in high yields without loss in enantioselectivities.
Synthesis of Aminocyclobutanes by Iron-Catalyzed [2+2] Cycloaddition
作者:Florian de Nanteuil、Jérôme Waser
DOI:10.1002/anie.201303803
日期:2013.8.19
Fab Four: An iron‐catalyzed [2+2] cycloaddition furnishes aminocyclobutanes with a broad range of substituents in excellent yields and diastereoselectivities. The products can be obtained on a gram scale and can be further converted to β‐peptide derivatives in a few steps. Furthermore, a [4+2] cycloaddition between an aminocyclobutane and an olefin leads to the corresponding cyclohexylamines.
Enantioselective Friedel−Crafts Alkylation of Indoles with Trifluoroethylidene Malonates by Copper−Bis(oxazoline) Complexes: Construction of Trifluoromethyl-Substituted Stereogenic Tertiary Carbon Center
作者:Lele Wen、Qilong Shen、Xiaolong Wan、Long Lu
DOI:10.1021/jo1024333
日期:2011.4.1
An enantioselective alkylation of indoles with trifluoroethylidene malonates catalyzed by copper(II)−bis (oxazoline) complexes has been developed. The expected adducts with a stereogenic tertiary carboncenter bearing a trifluoromethyl group were obtained in excellent yields (up to 99%) and ee values (up to 96% ee). The synthetic utility of this asymmetric catalytic reaction was demonstrated by the