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.