Efficient Cu-Catalyzed Asymmetric Conjugate Additions of Alkylzinc Reagents to Aromatic and Aliphatic Acyclic Nitroalkenes
作者:Dawn M. Mampreian、Amir H. Hoveyda
DOI:10.1021/ol0488338
日期:2004.8.1
Cu-catalyzed method for asymmetric conjugate addition (ACA) of alkylzinc reagents to acyclic disubstituted nitroalkenes is presented. Reactions are typically effected at ambient temperature in the presence of 2 mol % chiral dipeptide phosphine and 1 mol % (CuOTf)(2).C(6)H(6). Nitroalkenes bearing aromatic as well as aliphatic substituents readily undergo asymmetricadditions. [reaction: see text]
INTERMEDIATE COMPOUNDS OF TAMIFLU, METHODS OF PREPARATION AND USES THEREOF
申请人:Ma Dawei
公开号:US20140221662A1
公开(公告)日:2014-08-07
Chiral amino compounds, methods of preparation and uses thereof. Tamiflu can be obtained from the said compounds. Multi-substituted chiral tetrahydropyrrolyl amine which can be used as intermediate compounds of medicament can also be produced by the said compounds.
Cu-catalysed asymmetric 1,4-addition of Me3Al to nitroalkenes. Synthesis of (+)-ibuprofen
作者:Damien Polet、Alexandre Alexakis
DOI:10.1016/j.tetlet.2005.01.007
日期:2005.2
Trimethylaluminium undergoes enantioselective (ee up to 93%) copper-catalysed Michael addition to various nitroalkenes. Copper thiophenecarboxylate (CuTC) (2 mol %) and 4 mol% of a chiral phosphoramidite ligand are sufficient for a complete and clean reaction. The synthesis of (+)-ibuprofen is described with 82% ee. (C) 2005 Elsevier Ltd. All rights reserved.
US9040738B2
申请人:——
公开号:US9040738B2
公开(公告)日:2015-05-26
Highly Enantioselective Conjugate Addition of Dialkylzinc Reagents to Acyclic Nitroalkenes: A Catalytic Route to β<sup>2</sup>-Amino Acids, Aldehydes, and Alcohols
作者:Ate Duursma、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ja029817d
日期:2003.4.1
Using chiral phosphoramidite ligand (S,R,R)-L1 in the conjugate addition to acyclic nitroalkenes for the first time, we obtained enantioselectivities up to 98%. The use of acyclic substrates with different dialkylzinc reagents provides a catalytic enantioselective route to (functionalized) β2-amino aldehydes, acids, and alcohols.