A Chiral Phenoxyamine Magnesium Catalyst for the Enantioselective Hydroamination/Cyclization of Aminoalkenes and Intermolecular Hydroamination of Vinyl Arenes
作者:Xiaoming Zhang、Thomas J. Emge、Kai C. Hultzsch
DOI:10.1002/anie.201105079
日期:2012.1.9
If Grignard had only known! A chiral magnesium complex catalyzes the intramolecular hydroamination/cyclization of aminoalkenes with high efficiency at temperatures as low as −20 °C and enantioselectivities as high as 93 % ee. The high activity of this system also allows the catalytic intermolecular anti-Markovnikov addition of pyrrolidine and benzylamine to vinyl arenes.
complexes have been proven to promote the anti‐Markovnikov addition between various styrene derivatives and secondary amines efficiently. Although the reaction has to be performed at high temperature, it is realized advantageously with a 1:2 amine/alkene molar ratio to deliver the hydroamination product in a satisfactory isolated yield. Furthermore, the reaction with 2‐vinylpyridine proceeds at room temperature
A new decarboxylative N-alkylation reaction of α-aminoacids has been developed. A variety of tertiary amines were obtained in good to excellent yields via the decarboxylative N-alkylation reaction of α-aminoacids with primary alcohols catalyzed by a Cp*Ir complex.
Heavier Group 2 Metals and Intermolecular Hydroamination: A Computational and Synthetic Assessment
作者:Anthony G. M. Barrett、Christine Brinkmann、Mark R. Crimmin、Michael S. Hill、Patricia Hunt、Panayiotis A. Procopiou
DOI:10.1021/ja905615a
日期:2009.9.16
use of the group2 elements Mg, Ca, Sr, and Ba for the intermolecular hydroamination of ethene indicated that the efficiency of the catalysis is dependent upon both the polarity and the deformability of the electron density within the metal-substituent bonds of key intermediates and transition states. The validity of this analysis was supplemented by a preliminary study of the use of group2 amides for
使用第 2 族元素 Mg、Ca、Sr 和 Ba 进行乙烯分子间加氢胺化的密度泛函理论评估表明,催化效率取决于金属内电子密度的极性和变形能力-关键中间体和过渡态的取代键。使用第 2 组酰胺进行乙烯基芳烃分子间加氢胺化的初步研究补充了该分析的有效性。尽管发现锶提供最高的催化活性,与理论研究提供的预期一致,但初步动力学分析表明,这可能是该阳离子半径和可及性增加的结果,而不是势垒降低的反映用于决定烯烃插入的速率。
One-Pot Route from Halogenated Amides to Piperidines and Pyrrolidines
作者:Qiao Song、Sheng Wang、Xiangui Lei、Yan Liu、Xin Wen、Zhouyu Wang
DOI:10.3390/molecules27154698
日期:——
Piperidine and pyrrolidine derivatives are important nitrogen heterocyclic structures with a wide range of biological activities. However, reported methods for their construction often face problems of requiring the use of expensive metal catalysts, highly toxic reaction reagents or hazardous reaction conditions. Herein, an efficient routefrom halogenated amides to piperidines and pyrrolidines was disclosed