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
Copper Complex of Aminoisoborneol Schiff Base Cu
<sub>2</sub>
(SBAIB‐d)
<sub>2</sub>
: An Efficient Catalyst for Direct Catalytic Asymmetric Nitroaldol (Henry) Reaction
new bifunctional coppercomplex of the aminoisoborneolSchiffbase – Cu2(SBAIB‐d)2 – has been developed for the effective directcatalyticasymmetricHenryreaction. One mol% of this catalyst produces the expected Henry products in high yields (up to 99%) with excellent enantioselectivities (up to 98% ee). The utility of the present catalyst was also extended to the Henryreaction with nitroethane
A novel C1-symmetric dinitrogen ligand was synthesized in high yield from commercially available (1R,2R,3R,5S)-(-)-isopinocampheylamine and 1-methyl-2-imidazolecarboxaldehyde. In combination with Cu(OAc)2H2O, this new ligand promote the reaction between nitromethane and aliphatic aldehydes with high yields (up to 97%) and moderate enantioselectivities (up to 67% ee). The reactions with benzaldehyde
Asymmetric Copper(I)-Catalyzed Henry Reaction with an Aminoindanol-Derived Bisoxazolidine Ligand
作者:Kimberly Yearick Spangler、Christian Wolf
DOI:10.1021/ol9018612
日期:2009.10.15
Bisoxazolidine 1 is an effective ligand In the Me2Zn-promoted and the Cu(I)-catalyzed Henry reaction. While a wide range of nitroaldol products are obtained in high yields and ee's in both cases, the replacement of dimethylzinc with copper(l) acetate results in a complete reversal of the sense of asymmetric induction. The Cu(I)-catalyzed enantioselective addition of nitromethane to methyl 4-oxobutanoate followed by hydrogenation and spontaneous lactamization gives (S)-5-hydroxypiperidin-2-one in 72% overall yield and 98% ee which compares favorably with previously reported methods.
Highly Enantioselective Henry Reaction Catalyzed by C2-Symmetric Modular BINOL-Oxazoline Schiff Base Copper(II) Complexes Generated in Situ
作者:Wen Yang、Da-Ming Du
DOI:10.1002/ejoc.201001587
日期:2011.3
16-member library of C2-symmetric modular chiral BINOL-oxazoline Schiff base copper(II) complexcatalysts generated in situ was easily generated in a one-pot, three-component manner. This approach avoided the need for isolation and characterization of ligands and greatly improved the catalyst screening efficiency. This modular catalyst library was evaluated in the asymmetric Henry reaction, for which good
原位生成的 C 2 对称模块化手性 BINOL-恶唑啉席夫碱铜 (II) 配合物催化剂的 16 成员库很容易以一锅三组分的方式生成。这种方法避免了对配体的分离和表征的需要,大大提高了催化剂的筛选效率。该模块化催化剂库在不对称亨利反应中进行了评估,在温和条件下获得了良好的产率(高达 98%)和良好的对映选择性(高达 98% ee)。