Ruthenium-catalyzed acceptorless dehydrogenative coupling of o-aminobenzyl alcohols with ketones to quinolines in the presence of carbonate salt
作者:Xiangchao Xu、Yao Ai、Rongzhou Wang、Liping Liu、Jiazhi Yang、Feng Li
DOI:10.1016/j.jcat.2020.12.016
日期:2021.3
Cl][Cl] was designed, synthesized and found to be a general and highly efficient catalyst for the synthesis of quinolines via acceptorless dehydrogenative coupling of o-aminobenzyl alcohols with ketones in the presence of carbonate salt. It was confirmed that NH units in the ligand are crucial for catalytic activity. The application of this catalytic system for the scale-gram synthesis of biologically
This paper describes a visible-light-mediated oxidative cyclization of 2-aminobenzyl alcohols and secondaryalcohols to produce quinolines at room temperature. This photocatalytic method employed anthraquinone as an organic small-molecule catalyst and DMSO as an oxidant. According to this present procedure, a series of quinolines were prepared in satisfactory yields.
A visible-light-induced photoredoxMiniscialkylation reaction of N-heteroarenes with ethyl acetate has been reported. The low-toxic ethyl acetate was used for the first time as an alkylation reagent. Hence, 4-quinazolinones, quinolines and pyridines reacted smoothly in the current reaction system. Mechanistic studies indicate that LiBr plays a key role to dramatically improve the efficiency of the
quinolines with aldehydes, induced by sustainable visiblelight under mild conditions, are described. Non-toxic and inexpensive LiBr is found to be the key for the success of the atom-economical Minisci method. Combined with a highly oxidative photocatalyst and visiblelight irradiation, the bromide additive mediates the H abstraction/acyl radical formation directly from aldehydes. The present mild
Aerobic cross-dehydrogenative couplings of N-heteroarenes with toluene derivatives at room temperature
作者:Qiao-Lin Wang、Huawen Huang、Zhaozhao Sun、Yufeng Chen、Guo-Jun Deng
DOI:10.1039/d1gc02547c
日期:——
A set of mild aerobic cross-dehydrogenativecouplings of N-heteroarenes with the benzylic C(sp3)–H bond has been achieved by using visible-light-induced photocatalysis. This approach was found to provide a sustainable alternative to Minisci benzylation reactions using readily accessible toluene derivatives as benzylating agents. The unique combination of photocatalysis, bromo radical mediation, and