通过迈克尔加成/环化(Gabriel-Cromwell)工艺,在95℃下使用略有过量的伯胺和Cs 2 CO 3作为碱,由α-碘代环烯酮以很高的收率制备了氮丙啶。使用手性胺可以制备光学纯的氮丙啶。同样的方法对于由无环α-卤代饱和化合物合成氮丙啶也是有效的。2-氧氮杂双环与几种亲核试剂反应以优异的产率提供了α-杂原子取代的环状烯酮。
作者:M.Teresa Barros、Christopher D. Maycock、M.Rita Ventura
DOI:10.1016/s0040-4039(02)00791-8
日期:2002.6
α-iodocycloenones in very good yield, by a Michael addition/cyclisation (Gabriel–Cromwell) process employing a slight excess of primaryamine and Cs2CO3 as base at 95°C. Using chiralamines it was possible to prepare optically pure aziridines. The same method was also efficient for the synthesis of aziridines from acyclic α-halounsaturated compounds. 2-Oxoazabicycles reacted with several nucleophiles to afford
通过迈克尔加成/环化(Gabriel-Cromwell)工艺,在95℃下使用略有过量的伯胺和Cs 2 CO 3作为碱,由α-碘代环烯酮以很高的收率制备了氮丙啶。使用手性胺可以制备光学纯的氮丙啶。同样的方法对于由无环α-卤代饱和化合物合成氮丙啶也是有效的。2-氧氮杂双环与几种亲核试剂反应以优异的产率提供了α-杂原子取代的环状烯酮。
A Remarkably Efficient Phase-Transfer Catalyzed Amination of α-Bromo-α, β-Unsaturated Ketones in Water
作者:Alemayehu Mekonnen、Alemu Tesfaye
DOI:10.1155/2021/6616458
日期:2021.1.4
10 mol% of phase-transfer, PT catalysts in water. Some chiralquaternaryammonium salts derived from Cinchona alkaloids were investigated as water-stable PT catalysts. The scope and limitations of the reaction have also been investigated. The catalytic performances were significantly improved in comparison with the corresponding ordinary quaternaryammoniumsaltcatalysts, and excellent yields (81%–96%)
Preparation of N-arylamines from 2-oxo-7-azobicyclo[4.1.0]heptanes
作者:M. Teresa Barros、Suvendu S. Dey、Christopher D. Maycock、Paula Rodrigues
DOI:10.1016/j.tet.2012.05.054
日期:2012.8
A wide range of N-phenylated secondary amines were prepared directly from 2-oxo-7-azobicyclo[4.1.0]heptanes using 4-nitrobenzoic acid as acid catalyst. The intermediate enol esters could also be isolated under similar conditions. A catalytic cycle is proposed.
The Aza-Wharton Reaction: Syntheses of Cyclic Allylic Amines and Vicinal Hydroxyamines from the Respective Acylaziridines
作者:Saúl Silva、Paula Rodrigues、Isabel Bento、Christopher D. Maycock
DOI:10.1021/jo5029387
日期:2015.3.20
The Wharton reaction, initially described for acyl epoxides, has been studied using the structurally similar aziridines. By this reaction, a range of cyclic allylicamines and vicinal amino alcohols have been prepared stereoselectively and, in some cases, enantiomerically pure.