Synthesis of Chiral Tetrahydroisoquinoline and C 2-Symmetric Bistetrahydroisoquinoline Ligands and Their Application in the Enantioselective Henry Reaction
作者:Zaher Judeh、Duc Khong
DOI:10.1055/s-0035-1561634
日期:——
rigid chiral tetrahydroisoquinoline THIQ–Cu(OAc)2·H2O complex successfully catalyzed the enantioselective Henry reaction between various aldehydes and nitromethane and gives the β-nitro alcohol adducts in up to 96% yield and 80% ee. Application of chiral tetrahydroisoquinoline and bistetrahydroisoquinoline scaffolds in asymmetric reactions is limited by the inefficient synthesis of their chiral structural
Novel chiral bisoxazoline ligands based on norbornadiene were synthesized and used for the asymmetric Henry reaction. Various aromatic aldehydes were converted into chiral $\beta $-nitro alcohols with high yields and moderate to acceptable enantioselectivities under the optimized reaction conditions.
Cu-catalyzed asymmetric Henry reaction promoted by chiral camphor Schiff bases
作者:Tangqian Jiao、Jingxuan Tu、Gaoqiang Li、Feng Xu
DOI:10.1016/j.molcata.2016.02.004
日期:2016.5
Abstract Five novel chiral camphor Schiffbases have been synthesized and utilized as ligands in asymmetric Henry reaction between nitromethane and aldehydes. The diastereoisomeric Schiffbases 5a and 5a' were separated successfully and gave completely different absolute configurations in the reaction. The reactions were carried out with CuCl-Schiff base 5a complex under mild condition with good yields
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。
Asymmetric Henry reaction catalysed by L-proline derivatives in the presence of Cu(OAc)<sub>2</sub>: isolation and characterization of an<i>in situ</i>formed Cu(II) complex
作者:H. Atoholi Sema、Ghanashyam Bez、Sanjib Karmakar
DOI:10.1002/aoc.3123
日期:2014.4
by the Henry reaction is one of the most exploited carbon–carbon bond‐formingreactions owing to the versatility of both functional groups for synthetic manipulation by functional group interconversion. Here we report synthesis of a series of proline‐derived compounds to study their catalytic activities for asymmetric Henry reaction in the presence of Cu(OAc)2.H2O. The proline derivative, 2‐((E)‐(((