A Single Lipase-Catalysed One-Pot Protocol Combining Aminolysis Resolution and Aza-Michael Addition: An Easy and Efficient Way to Synthesise β-Amino Acid Esters
was developed to obtain chiral β-amino acid esters with lipase B from Candida antarctica (CAL-B) as the only catalyst. This method is conducted under mild reaction conditions and is very easy to handle. After a series of detailed optimization studies, ten racemic aromatic or aliphatic amines were subjected to this one-pot procedure, and twelve chiral β-amino acid esters and ten chiral amides were successfully
开发了一种结合 aza-Michael 加成和氨解拆分的新型一锅法,以来自南极念珠菌 (CAL-B) 的脂肪酶 B 作为唯一催化剂获得手性 β-氨基酸酯。该方法在温和的反应条件下进行,非常容易操作。经过一系列详细的优化研究,10 种外消旋芳香族或脂肪族胺经过此一锅法处理,成功合成了 12 种手性 β-氨基酸酯和 10 种手性酰胺,其 ee 值在理论产率下具有优异的值。放大程序也没有明显降低反应速率或对映选择性,这使得该方法适用于手性 β-氨基酸酯的大规模生产。
Asymmetric Formation of Quaternary Centers through Aza-Annulation of Chiral β-Enamino Amides with Acrylate Derivatives
作者:Petr Benovsky、Gregory A. Stephenson、John R. Stille
DOI:10.1021/ja9729591
日期:1998.3.1
active primary amine, either (R)-α-methylbenzylamine or α-amino esters, generated the corresponding optically active tetrasubstituted secondary enamine, in which the enamine tautomer was stabilized through conjugation with an amide carbonyl. Treatment of the intermediate enamine with acryloyl chloride, acrylic anhydride, or sodium acrylate/ethyl chloroformate resulted in aza-annulation to give the corresponding
Studies in the Synthesis and Reactivity of New Chiral 1-[(Trialkylsilyl)-methyl]propenamides
作者:Samir BouzBouz
DOI:10.1055/s-0030-1260960
日期:2011.8
A very simple sequence of reactions such as cross-metathesis using two catalysts and allylation to give the chiral hydroxyamide is described.
介绍了一种非常简单的反应序列,如使用两种催化剂的交叉易位反应和烯丙基化反应,以得到手性羟基酰胺。
Silver Acetate Catalysed Asymmetric1,3-Dipolar Cycloadditions of Imines and Chiral Acrylamides
作者:Miklós Nyerges、David Bendell、Andrea Arany、David E. Hibbs、Simon J. Coles、Michael B. Hursthouse、Paul W. Groundwater、Otto Meth-Cohn
DOI:10.1055/s-2003-39325
日期:——
N-Metallated azomethine ylides 5 were generated by the reaction of arylidene glycine imines 1 with AgOAc and triethylamine. These azomethine ylides undergo cycloaddition to chiral acrylamides 2 with excellent diastereoselectivity. The configuration of two of the cycloadducts (3a 1 and 3c 1 ) has been confirmed by X-ray crystallography.
Simple organometallic chiral derivatising agents for the<sup>31</sup>P n.m.r. assay of the enantiomeric purity of certain η<sup>2</sup>-donors
作者:David Parker、Richard J. Taylor
DOI:10.1039/c39870001781
日期:——
The chiral palladium and platinum ethene complexes (1) act as chiral derivatising agents for the 31P n.m.r. assay of the enantiomeric purity of certain chiral alkenes and allenes.