化学
胺化
钴
催化作用
离子液体
四氟硼酸盐
还原胺化
酒
醛
有机化学
烷基化
组合化学
作者
Zhengang Ke,Yuepeng Wang,Yanfei Zhao,Minhao Tang,Wei Zeng,Ying Wang,Xiaoqian Chang,Buxing Han,Zhimin Liu
出处
期刊:Chemsuschem
[Wiley]
日期:2023-05-16
卷期号:16 (17): e202300513-e202300513
被引量:5
标识
DOI:10.1002/cssc.202300513
摘要
Abstract Higher amines are important high‐valuable chemicals with wide applications, and amination of alcohols is a green route to them, which however generally suffers from harsh reaction conditions and use of equivalent base. Herein, we report an ionic‐liquid (IL) hydrogen‐bonding promoted dihydrogen autotransfer strategy for amination of alcohols to higher amines over cobalt catalyst under base‐free conditions. Co(BF 4 ) 2 ⋅ 6 H 2 O complexed with triphos and IL (e. g., tetrabutylphosphonium tetrafluoroborate, [P 4444 ][BF 4 ]) shows high performances for the reaction and is tolerant of a wide scope of amines and alcohols, affording higher amines in good to excellent yields. Mechanism investigation indicates that the [BF 4 ] − anion activates the alcohol via hydrogen bonding, promoting transfer of both hydroxyl H and α‐H atoms of alcohol to the cobalt catalyst to form an aldehyde intermediate and cobalt dihydride complex, which are involved in the subsequent reductive amination. This strategy provides a green and effective route for alcohol amination, which may have promising applications in alcohol‐involved alkylation reactions.
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