Bifunctional Thiourea Catalyzed Asymmetric Mannich Reaction Using Trifluoromethyl Aldimine as Trifluoromethyl Building Blocks
作者:Yingpeng Su、Yulai Hu、Shilong Ji、Ahmed Alkhalil、Xiaowen Xia、Siying Chong、Ke-Hu Wang、Danfeng Huang、Ying Fu
DOI:10.1055/s-0034-1380693
日期:——
An efficient bifunctionalthiourea catalyzed asymmetricMannichreaction with trifluoromethyl aldimine as trifluoromethyl building block was achieved to give the products in good diastereoselectivity and enantioselectivity.
Bifunctional chiral thioureas have been successfully used as organocatalysts in enantioselectivefluorinations of β-ketoesters. The corresponding products could be obtained with good to excellent enantioselectivity in high yields by using N-fluorobisbenzenesulphonimide (NFSI) as fluorination reagent.
Enantioselective fluorination of β-ketoesters catalysed by complexes of new mono-oxazoline ligands
作者:Teng Niu、Xiping Han、Danfeng Huang、Ke-Hu Wang、Yingpeng Su、Yulai Hu、Ying Fu
DOI:10.1016/j.jfluchem.2015.02.017
日期:2015.7
A new kind of mono-oxazoline ligands which combined diaryl methyl units and chiral oxazoline units together using pyridine as linker was prepared. Their applications in enantioselective electrophilic fluorination of beta-ketoesters by NFSI were investigated, and the corresponding products were obtained in excellent yield (up to 90%) and good enantioselectivity (78%) in CH2Cl2 at -60 degrees C. (C) 2015 Elsevier B.V. All rights reserved.