A new type of L-Tertiary leucine-derived ligand: Synthesis and application in Cu(II)-catalyzed asymmetric Henry reactions
作者:Zedong Cai、Ting Lan、Pengfei Ma、Jingfang Zhang、Qingqing Yang、Wei He
DOI:10.1016/j.tet.2019.130469
日期:2019.8
of Schiff bases derivedfrom amino acids were developed as chiral ligands for Cu(II)-catalyzed asymmetric Henryreactions. The optimum ligand 7d exhibited outstanding catalytic efficiency in the Cu(II)-catalyzed asymmetric Henry additions of four nitroalkanes to different kinds of aldehydes to produce 76 desired adducts in high yields (up to 96%) with excellent enantioselectivities, up to 99% enantiomeric
Synthesis of chiral salan ligands with bulky substituents and their application in Cu-catalyzed asymmetric Henry reaction
作者:Zhou Wang、Jianghao He、Ying Mu
DOI:10.1016/j.jorganchem.2020.121546
日期:2020.12
Several new chiral N,N’-dimethylated salan ligands with bulky substituents were synthesized and their in-situ generated Cu(II) complexes were evaluated in the asymmetric Henry reaction. Substituents on the aryloxide moieties of these ligands were found to show remarkable effect on the enantioselectivity. Cu(II) complex generated from the ligand with 1,1-diphenylethyl groups at the ortho-position of
An easily available N,N′-dioxide/Cu(I) complex has been developed for the catalyticasymmetric nitroaldol (Henry) reaction of aldehydes with nitroethane. Under mild reaction conditions, a series of substituted aromatic, heteroaromatic and α,β-unsaturated aldehydes are transformed to the corresponding anti-β-nitroalcohols in good to excellent yields (up to 99%) with moderate to good dr (up to 16.7:1
已开发出一种易于获得的N,N'-二氧化物/ Cu(I)络合物,用于醛与硝基乙烷的催化不对称硝基醛醇(Henry)反应。下温和的反应条件下,一系列的取代的芳族,杂芳族和α,β -不饱和醛转化为相应的抗-β-硝基醇以良好至优异的产率(高达99%)的中度至良好博士(高达1670: 1 anti / syn)和高ee值(高达97%)。除硝基乙烷外,还使用硝基甲烷和1-硝基丙烷作为亲核试剂,并获得了良好的对映选择性。
Catalytic anti-selective asymmetric Henry (nitroaldol) reaction catalyzed by Cu(I)–amine–imine complexes
作者:Yao Qiong Ji、Gao Qi、Zaher M.A. Judeh
DOI:10.1016/j.tetasy.2011.12.010
日期:2011.12
derived from N-methyl-C1-tetrahydro-1,1′-bisisoquinolines (R)-1b and Cu(I)Cl promoted the diastereoselective Henry reaction of nitroethane with a series of aromatic and aliphatic aldehydes. The nitroalcohol adducts were obtained in excellent yields (up to 95%), moderate anti-selectivity (up to 2.6:1), and good enantioselectivity (up to 92% ee) without any special precautions to exclude moisture or air
Design of a Chiral Secondary Amine Ligand for Copper-Catalyzed anti-Selective Henry Reaction
作者:Takayoshi Arai、Akinori Joko、Katsuya Sato
DOI:10.1055/s-0034-1379607
日期:——
A series of chiral binaphthyl-containing diphenylethylenediamine (binaph-dpen) ligands was designed and synthesized for the copper-catalyzed asymmetric Henry reaction. The N-monobenzyl (S)-binaph-(R,R)-dpen ligand, with a secondaryamine portion, promoted the Cu(OAc)2-catalyzed Henry reaction with excellent enantioselectivity in an anti-selective manner.