Organocatalytic Asymmetric Addition of Thiols to Trifluoromethylaldimine: An Efficient Approach to Chiral Trifluoromethylated<i>N</i>,<i>S</i>-Acetals
作者:Xin Fang、Qing-Hua Li、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1002/adsc.201200845
日期:2013.1.16
The first organocatalyticasymmetric addition of thiols to trifluoromethylaldimine for the construction of chiral trifluoromethylated N,S-acetals has been achieved in high yields (up to 99%) and excellent enantioselectivities (up to 95% ee) with 1 mol% of a bifunctional organocatalyst.
Asymmetric construction of fluorinated imidazolidines via Cu(i)-catalyzed exo′-selective 1,3-dipolar cycloaddition of azomethine ylides with fluorinated imines
作者:Qing-Hua Li、Liang Wei、Xuan Chen、Chun-Jiang Wang
DOI:10.1039/c3cc43025a
日期:——
Expedient access to optically active fluorinated 2,4-trans-imidazolidines was successfully developed via Cu(I)-catalyzed exo'-selective 1,3-DC of azomethine ylides with fluorinated imines.
Axially chiral phosphine–oxazoline ligands in the silver(I)-catalyzed asymmetric Mannich reaction of fluorinated aldimines with trimethylsiloxyfuran
作者:Qian-Yi Zhao、Zhi-Liang Yuan、Min Shi
DOI:10.1016/j.tetasy.2010.05.025
日期:2010.4
Axiallychiralphosphine–oxazolineligand L7, prepared from (S)-binol, was found to be a fairly effective chiralligand in the silver(I)-catalyzed asymmetricMannichreaction of fluorinated aldimines with trimethylsiloxyfuran to give the corresponding adducts in up to 99% yield, over 20:1 dr and 81% ee.