New N-terminal prolyl-dipeptide derivatives as organocatalysts for direct asymmetric aldol reaction
作者:Ji-Fu Zheng、Yao-Xian Li、Suo-Qin Zhang、Song-Tao Yang、Xiao-Ming Wang、Yong-Zhi Wang、Jie Bai、Fu-An Liu
DOI:10.1016/j.tetlet.2006.08.084
日期:2006.10
A series of new N-terminal prolyl-dipeptide derivatives have been synthesized and evaluated as organocatalysts for the direct asymmetric aldol reaction of acetone with electron-deficient aromatic aldehydes. At room temperature, the presence of 10 mol % of catalysts 2 and 5 efficiently catalyzes the direct asymmetric aldol reaction to give the aldol adducts with modest to excellent enantiomeric excesses
Synthesis and applications in Henry reactions of novel chiral thiazoline tridentate ligands
作者:Ye Shi、Yang Li、Jingbo Sun、Qi Lai、Chiyu Wei、Zhiyong Gong、Qiang Gu、Zhiguang Song
DOI:10.1002/aoc.3347
日期:2015.10
Several novelchiral tridentate ligands containing thiazoline were efficiently synthesized from commercially available l=cysteine in high yield. These ligands were subsequently applied to the asymmetricHenryreaction of nitromethane and various aldehydes. It was found that the structures of the thiazoline ligands had a significant influence on the enantioselectivity. It was shown that the optimal