Catalytic asymmetric Mannich-type reactions of fluorinated ketoesters with N-Boc aldimines in the presence of chiral palladium complexes
摘要:
The catalytic enantioselective Mannich reaction promoted by chiral palladium complexes is described. The treatment of alpha-fluoro-beta-ketoesters with N-Boc-aldimines under mild reaction conditions afforded the corresponding beta-aminated alpha-fluoro-beta-ketoesters with excellent enantioselectivities (up to 99% ee). (C) 2011 Elsevier Ltd. All rights reserved.
Asymmetric generation of fluorine-containing quaternary carbons adjacent to tertiary stereocenters: uses of fluorinated methines as nucleophiles
作者:Xiao Han、Jie Luo、Chen Liu、Yixin Lu
DOI:10.1039/b823184b
日期:——
Organocatalytic asymmetric Michael reactions of fluorinatednucleophiles with nitroolefins catalyzed by Cinchona alkaloid-derived thiourea catalysts generated the desired Michael products containing vicinal fluorinated quaternary and tertiary chiral centers with exceptional enantioselectivity.
Gold-catalyzed Fluorination of Alkynyl Esters and Ketones: Efficient Access to Fluorinated 1,3-Dicarbonyl Compounds
作者:Xiaojun Zeng、Zhichao Lu、Shiwen Liu、Gerald B. Hammond、Bo Xu
DOI:10.1002/adsc.201701179
日期:2017.11.23
We developed an efficient synthesis of 2-fluoro-1,3-dicarbonyl compounds using readily available alkynyl ketones or esters as starting material. The key step is the insertion of hydrogen fluoride (HF) to the gold carbene intermediate generated from cationic gold catalyzed addition of N-oxides to alkynyl ketones or esters. This method gives excellent chemical yields and regioselectivity with good functional
Catalytic asymmetric Mannich-type reactions of fluorinated ketoesters with N-Boc aldimines in the presence of chiral palladium complexes
作者:Young Ku Kang、Dae Young Kim
DOI:10.1016/j.tetlet.2011.02.087
日期:2011.5
The catalytic enantioselective Mannich reaction promoted by chiral palladium complexes is described. The treatment of alpha-fluoro-beta-ketoesters with N-Boc-aldimines under mild reaction conditions afforded the corresponding beta-aminated alpha-fluoro-beta-ketoesters with excellent enantioselectivities (up to 99% ee). (C) 2011 Elsevier Ltd. All rights reserved.