N-Bromosuccinimide promoted and base switchable one pot synthesis of α-imido and α-amino ketones from styrenes
作者:Mahesh H. Shinde、Umesh A. Kshirsagar
DOI:10.1039/c5ob02034d
日期:——
N-Bromosuccinimide (NBS) promoted one pot strategy for the synthesis of α-amino functionalized aryl ketones starting from commercially available styrenes has been developed. NBS participates in multiple tasks, such as bromonium ion formation, oxidation of bromohydrin and providing a nucleophilic nitrogen source. The reaction can easily be switched between α-imido and α-amino ketones by the choice of base
A facile transformation of alkynes into α-amino ketones by an N-bromosuccinimide-mediated one-pot strategy
作者:Ting Wei、Yongming Zeng、Wei He、Lili Geng、Liang Hong
DOI:10.1016/j.cclet.2018.03.031
日期:2019.2
Abstract A faciletransformation of alkynes into α-amino ketones by an N-bromosuccinimide-mediated one-pot cascade strategy is described. A variety of α-amino ketones are obtained in moderate to good yields under mild conditions. To overcome the multi-step synthesis, N-bromosuccinimide is involved in multiple tasks, playing a key role in the reaction course.
[EN] A METAL FREE PROCESS FOR THE PREPARATION OF ALPHA-SUBSTITUTED CARBONYL COMPOUNDS FROM ALKENES<br/>[FR] PROCÉDÉ SANS MÉTAL POUR LA PRÉPARATION DE COMPOSÉS DE CARBONYLE ALPHA-SUBSTITUÉS À PARTIR D'ALCÈNES
申请人:COUNCIL SCIENT IND RES
公开号:WO2017077550A1
公开(公告)日:2017-05-11
The present invention discloses a novel metal free process for the regioselective synthesis of α-substituted carbonyl compounds of formula I from alkene, X is selected from the following compounds (A, B).
One-Pot Cascade Leading to Direct α-Imidation of Ketones by a Combination of <i>N</i>-Bromosuccinimide and 1,8-Diazabicyclo[5.4.1]undec-7-ene
作者:Ying Wei、Shaoxia Lin、Fushun Liang
DOI:10.1021/ol301871s
日期:2012.8.17
A one-pot cascade transformation of ketones into alpha-imidoketones has been developed, in which N-bromosuccinimide (NBS) provides both electrophilic bromine and nucleophilic nitrogen sources, and diazabicyclo[5.4.1]undec-7-ene (DBU) functions as a base and a nucleophilic promoter for the activation of NBS. alpha-Bromination is supposed as the key step in the process, which takes place between more electrophilic bromide active species and enolates.
Regioselective Oxo-Amination of Alkenes and Enol Ethers with <i>N</i>-Bromosuccinimide–Dimethyl Sulfoxide Combination: A Facile Synthesis of α-Amino-Ketones and Esters
作者:Pragati K. Prasad、Rambabu N. Reddi、Arumugam Sudalai
DOI:10.1021/acs.orglett.5b03540
日期:2016.2.5
amines as N-sources and dimethyl sulfoxide (DMSO) as the oxidant and also leads to the production of amino alcohols in a single step on reduction, thus broadening the scope of this operationally simple reaction. For the first time, the formation of reactive Me2S+–O–Br species generated by the interaction of NBS with DMSO has been proven.
已经开发出前所未有的烯烃和烯醇醚向相应的α-亚氨基羰基化合物的转化,其具有优异的区域选择性和产率。该羰基化胺化工艺使用现成的N-溴琥珀酰亚胺(NBS)和仲胺作为N源,并使用二甲基亚砜(DMSO)作为氧化剂,而且一步一步还原就可生产氨基醇,从而扩大了范围操作上的简单反应 首次证明了NBS与DMSO相互作用产生的反应性Me 2 S + -O-Br物种的形成。