One-Pot Catalytic Approach for the Selective Aerobic Synthesis of Imines from Alcohols and Amines Using Efficient Arene Diruthenium(II) Catalysts under Mild Conditions
作者:Sundar Saranya、Rengan Ramesh、Jan Grzegorz Małecki
DOI:10.1002/ejoc.201701408
日期:2017.12.8
A green and efficient catalytic approach for the selective synthesis of imines in air at room temperature was achieved with the aid of newly synthesised diruthenium(II) complexes [(η6-p-cymene)2Ru2Cl2(µ-L)] containing substituted 1,2-diacylhydrazine ligands. All the new complexes were fully characterised by analytical and spectroscopic techniques. The solid-state structure of a representative complex
借助新合成的含有取代 1,2 的二钌 (II) 配合物 [(η6-p-cymene)2Ru2Cl2(μ-L)],实现了一种绿色高效的室温下在空气中选择性合成亚胺的催化方法-二酰基肼配体。通过分析和光谱技术对所有新复合物进行了充分表征。通过单晶 X 射线衍射分析解决了代表性复合物的固态结构。二钌 (II) 配合物还可将醇选择性有氧氧化为醛。催化反应在作为绿色廉价氧化剂的空气存在下进行,并释放出作为唯一副产物的水。提出了亚胺形成的合理机制,据信这是通过醛中间体进行的。
Synthesis of new chiralcis-3-hydroxyazetidines and their application in diethylzinc addition to aldehydes
作者:Zhanbin Zhang、Min Li、Guofu Zi
DOI:10.1002/chir.20470
日期:2007.11
A new series of chiral cis-3-hydroxyazetidines have been prepared from (R)-1-phenylethylamine. They have excellent catalytic activities and enantiomeric selectivities in asymmetricaddition of diethylzinc to aromatic aldehydes.
One-pot synthesis of optically active 1,4-disubstituted-3-carbamoyl-azetidinones from 5-[(N-arylamino)(hydroxyl)methylene]-2,2-dimethyl-1,3-dioxa-4,6-diones and chiral aldimines is achieved via thermal generation of carbamoyl ketenes and subsequent [2+2] cycloaddition. Three possible chiral induction approaches were tested and (R)-(+)-1-phenylethylamine was confirmed as the best chiral auxiliary. Among
Double Stereodifferentiation in the Catalytic Asymmetric Aziridination of Imines Prepared from α-Chiral Amines
作者:Li Huang、Yu Zhang、Richard J. Staples、Rui H. Huang、William D. Wulff
DOI:10.1002/chem.201102520
日期:2012.4.23
The catalyticasymmetricaziridination of imines and diazo compounds (AZ reaction) mediated by boroxinate catalysts derived from the VANOL and VAPOL ligands was investigated with chiral imines derived from five different chiral, disubstituted, methyl amines. The strongest matched and mismatched reactions with the two enantiomers of the catalyst were noted with disubstituted methyl amines that had one
Dual Stereochemical Control in Reaction of Di- and Trialkyl Phosphites with Aldimines
作者:G. A. Kachkovskii、N. V. Andrushko、S. Yu. Sheiko、O. I. Kolodyazhnyi
DOI:10.1007/s11176-005-0502-9
日期:2005.11
and trialkyl phosphites to C=N compounds was investigated. Reactions of achiral dialkyl phosphites with chiral aldimines as well as that of chiral di-(1 R ,2 S ,5 R )-menthyl phosphite with achiral aldimines result in low diastereomeric enrichment of the addition compound. Reaction stereoselectivity increased when supplementary chiral inductor was introduced to the reaction system. Reaction of di-(1 R
研究了将亚磷酸二烷基酯和亚磷酸三烷基酯添加到C = N化合物中的立体化学。非手性亚磷酸二烷基酯与手性醛亚胺的反应以及手性二-(1 R ,2 S ,5 R )-薄荷基亚磷酸酯与非手性醛亚胺的反应导致加成化合物的非对映异构体富集度低。当将补充手性诱导剂引入反应体系时,反应立体选择性增加。亚磷酸二(1 R ,2 S ,5 R )-薄荷基亚磷酸酯与( S )-α-甲基苄基苯甲二胺以一致的不对称诱导进行,形成了一种实际上是N-取代的氨基膦酸的非对映异构体。然而,二- (1反应 - [R ,2 小号 ,5 - [R )-薄荷基酯与( [R )-α-methylbenzylbenzaldimine进行不一致不对称诱导,并且产物的非对映体富集低。通过化学推断,确定了所形成化合物的绝对构型。三((1 R ,2 S ,5 R 亚磷酸薄荷基酯在三氟化硼醚化物的存在下与C = N化合物反应形成氨基膦酸衍生物,其绝对构型与二亚磷酸(1