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
A new class of chiral sulfoxideâSchiff base ligands has been developed by the rational combination of two privileged chiral backbones. These sulfoxideâSchiff base ligands were found to be highly efficient for Cu-catalyzed asymmetric Henry reactions (up to 98% yield and 96% ee).
Enantioselective Henry reaction catalyzed by a copper(II) glucoBOX complex
作者:B.V. Subba Reddy、Jimil George
DOI:10.1016/j.tetasy.2011.06.012
日期:2011.6
A highlyenantioselectiveHenryreaction has been developed using a chiral copper(II)–glucoBOX complex. The catalytic system works well with a wide range of aromatic, aliphatic and heteroaromatic aldehydes to afford the corresponding nitroalkanols with high enantioselectivity (up to 99%) in excellent yields (up to 95%). The catalyst shows good enantioselectivity with 10 mol % of loading at easily attainable
alcohol–CuII catalyst: Highlyenantioselective Henry reactions between aromatic aldehydes and nitromethane have been developed. The reactions were catalyzed by an easily available and operationally simple amino alcohol–copper(II) catalyst (see scheme). In total, 38 substrates were tested and the R‐configured products were obtained in good yields with excellent enantioselectivities.
氨基醇-Cu II 催化剂:已开发出芳香醛与硝基甲烷之间的高度对映选择性的亨利反应。反应是由易于获得且操作简单的氨基醇-铜(II)催化剂催化的(请参见方案)。总共测试了38种底物,并以高收率和出色的对映选择性获得了R构型的产品。
Synthesis of planar chiral [2.2]paracyclophane Schiff bases for the enantioselective Henry reaction
A series of diastereomerically pure Schiff baseligandsbased on [2.2]paracyclophane backbones were synthesized and separated. The new planarchiral [2.2]paracyclophane Schiff bases were used as ligands in Cu-catalyzed asymmetric Henry reactions with high yields and enantioselectivities.