报道了一种新的溴化铜( II )/ N-甲基吗啉N-氧化物(NMO)促进的连续流动条件下酯的α-胺化方法,并减少了催化剂负载量。α-氨基酯是合成α-氨基酸的前体。该方法提供 α-氨基酯,产率为 58-83%。所需的 Cu( II )Br 催化剂通过在 NMO 存在下原位氧化 Cu( I )Br来再生。
Ruthenium-Catalyzed One-Pot Carbenoid N−H Insertion Reactions and Diastereoselective Synthesis of Prolines
作者:Qing-Hai Deng、Hai-Wei Xu、Angella Wing-Hoi Yuen、Zhen-Jiang Xu、Chi-Ming Che
DOI:10.1021/ol800087p
日期:2008.4.1
3-hydroxyprolines and various other amino esters are conveniently prepared by [RuCl2(p-cymene)]2-catalyzed one-pot intramolecular and intermolecular carbenoid N-H insertionreactions, respectively, and the prolines are formed with high diastereoselectivities. The catalytic reactions are tolerant toward air/moisture, and the product yields are insensitive to the organic solvents used.
Synthesis and characterization of bisoxazolines- and pybox-copper(<scp>ii</scp>) complexes and their application in the coupling of α-carbonyls with functionalized amines
[(Dm-Pybox)CuBr2] is efficient in catalyzing α-amination of ketones and esters, which tolerates functionality on the carbonyl and amine reaction components.