The aza-addition of aziridines for vicinal-diamines was firstly disclosed under catalyst- and solvent-free conditions. Various aryl, alkyl and meso-bicyclic aziridines with a Ts-protecting group were tolerated, and aromatic amine-nucleophiles containing...
Sulphated zirconia is an efficient catalyst for the regioselective ring-opening of aryl-substituted aziridines. This heterogeneous catalyst can be used several times without loss of activity and is compatible with a variety of acid sensitive and slightly basic nucleophiles.
The nucleophilic ring-opening of aziridine derivatives provides an important synthetic tool for the preparation of various β-functionalized amines. Amines as nucleophiles are employed to prepare synthetically useful 1,2-diamines in the presence of various catalysts or activators. Herein, the B2(OH)4-mediated reductivering-opening transformation of N-tosyl aziridines by nitroarenes was developed. This
氮丙啶衍生物的亲核开环为制备各种β-官能化胺提供了重要的合成工具。胺作为亲核试剂用于在各种催化剂或活化剂存在下制备合成有用的1,2-二胺。在此,开发了B 2 (OH) 4介导的硝基芳烃对N-甲苯磺酰基氮丙啶的还原开环转化。该水性方案采用硝基芳烃作为廉价且容易获得的氨基源,并在无外部催化剂的条件下进行。对照实验和DFT计算表明硝基芳烃通过N-芳基硼酰胺酸( E )原位还原为芳基胺,并通过所得芳基胺对N-甲苯磺酰基氮丙啶进行S N 1型开环,具有高区域选择性。
Kinetic Resolution of 1,
<scp>2‐Diamines</scp>
via Organocatalyzed Asymmetric Electrophilic Aminations of Anilines
作者:Jinglei Xie、Zheng Guo、Wei Liu、Dekun Zhang、Yu‐Peng He、Xiaoyu Yang
DOI:10.1002/cjoc.202200125
日期:2022.7.15
efficient kinetic resolution (KR) protocol for 1,2-diamines has been developed through asymmetric electrophilic aminations of anilines enabled by chiral phosphoric acid catalysis. A wide array of substituted 1,2-diamines were compatible with this method, generating both the recovered staring materials and the amination products with high enantioselectivities (with s-factor up to 218). Notably, this method