New Highly Asymmetric Henry Reaction Catalyzed by CuII and aC1-Symmetric Aminopyridine Ligand, and Its Application to the Synthesis of Miconazole
作者:Gonzalo Blay、Luis R. Domingo、Victor Hernández-Olmos、José R. Pedro
DOI:10.1002/chem.200800069
日期:2008.5.19
A new catalytic asymmetricHenryreaction has been developed that uses a C(1)-symmetric chiral aminopyridineligand derived from camphor and picolylamine. A variety of aromatic, heteroaromatic, aliphatic, and unsaturated aldehydes react with nitromethane and other nitroalkanes in the presence of DIPEA (1.0 equiv), Cu(OAc)(2)*H(2)O (5 mol %), and an aminopyridineligand (5 mol %) to give the expected
Asymmetric Henry reactions of aldehydes with various nitroalkanes catalyzed by copper(II) complexes of novel chiral<i>N</i>-monoalkyl cyclohexane-1,2-diamines
作者:Fei Liu、Shaohua Gou、Lei Li
DOI:10.1002/aoc.3107
日期:2014.3
2‐diamine (3g), the reaction was optimized in terms of the metal ion, temperature, solvent and base. Further experiments indicated that the complex, 3g–Cu(OAc)2, was an efficient catalyst in the asymmetricHenryreaction between different aldehydes and nitromethane, and the desired products have been obtained with high chemical yields (up to 99%) and high enantiomeric excess (up to 93%). The optimized catalyst
A Highly Diastereo- and Enantioselective Copper(I)-Catalyzed Henry Reaction Using a Bis(sulfonamide)−Diamine Ligand
作者:Wei Jin、Xincheng Li、Boshun Wan
DOI:10.1021/jo101932a
日期:2011.1.21
bis(sulfonamide)−diamine (BSDA) ligands were synthesized from commercially available chiral α-amino alcohols and diamines. The chiral BSDA ligand 3a, coordinated with Cu(I), catalyzes the enantioselective Henry reaction with excellent enantioselectivity (up to 99%). Moreover, with the assistance of pyridine, a CuBr−3a system promotes the diastereoselective Henry reaction with various aldehyde substrates
Asymmetric Henry Reactions Catalyzed by Metal Complexes of Chiral Boron-Bridged Bisoxazoline (borabox) Ligands
作者:Aurélie Toussaint、Andreas Pfaltz
DOI:10.1002/ejoc.200800570
日期:2008.9
Metalcomplexes of boron-bridgedbisoxazolines (boraboxligands) were evaluated as catalysts for the Henryreaction. Copper(II) complexes induced high enantio- and diastereoselectivity in reactions with nitroethane and nitropropane. The amount of base added had a strong influence on the formation of the chiralcomplex and the enantioselectivity. Comparison with the corresponding dimethylmethylene-bridged
New rhodium(I) complexes [Rh(CO)(L)] (1–3) were prepared by the reaction of [RhCl(CO)(PPh3)2] with 9,10-phenanthrenequinone-N-substituted thiosemicarbazones (HL1-3) and characterized by elemental and spectral analyses (IR, UV–Vis, 1H and 13C NMR, ESI-Mass). The structure of the complex, [Rh(CO)(L1)] (1) has been established by single-crystal X-ray diffraction analysis. The structure has also been optimized
新铑(I)配合物的[Rh(CO)(L)](1 - 3)通过[的RhCl(CO)(PPH反应制备3)2 ]与9,10-菲醌-N-取代缩氨基硫脲(HL 1-3),并通过元素和光谱分析(IR,UV-Vis,1 H和13 C NMR,ESI-Mass)进行表征。配合物的结构[Rh(CO)(L 1)](1)是通过单晶X射线衍射分析确定的。还使用LANL2DZ基集通过DFT方法对结构进行了优化。在室温下,在离子液体存在下,合成的络合物用作苯甲醛与硝基乙烷的非对映选择性硝基羟醛反应的催化剂。发现优化的催化剂2在各种芳族醛和硝基烷之间的不对称亨利反应中是有效的。在多达五次催化运行中检查了催化剂的可重复使用性。结果表明收率略有损失,产物保留了非对映选择性。相信该方法为容易地合成大量非对映异构富集的β-硝基醇提供了机会。