Cooperativity within the catalyst: alkoxyamide as a catalyst for bromocyclization and bromination of (hetero)aromatics
作者:Haripriyo Mondal、Md Raja Sk、Modhu Sudan Maji
DOI:10.1039/d0cc04673f
日期:——
Alkoxyamide has been reported as a catalyst for the activation of N-bromosuccinimide to perform bromocyclization and bromination of a wide range of substrates in a lipophilic solvent, where adequate suppression of the background reactions was observed. The key feature of the active site is the alkoxy group attached to the sulfonamide moiety, which facilitates the acceptance as well as the delivery
Bis-selenonium Cations as Bidentate Chalcogen Bond Donors in Catalysis
作者:Xinxin He、Xinyan Wang、Ying-Lung Steve Tse、Zhihai Ke、Ying-Yeung Yeung
DOI:10.1021/acscatal.1c03622
日期:2021.10.15
Lewisacids are frequently employed in catalysis but they often suffer from high moisture sensitivity. In many reactions, catalysts are deactivated because of the problem that strong Lewisacids also bond to the products. In this research, hydrolytically stable bidentateLewisacid catalysts derived from selenonium dicationic centers have been developed. The bis-selenonium catalysts are employed in
developed via the oxidative umpolung of bromide using alkali metal bromide and inorganic oxidant to provide the corresponding cyclization products in high yields. In particular, the use of AcOEt, the solvent of choice for green sustainable reactions, led to the high reactivities of the present reactions. This methodology is highly recommended for green sustainable chemistry because it uses stable and non-hazardous
Ortho-substituted iodobenzenes as novel organocatalysts for bromination of alkenes
作者:D. Christopher Braddock、Gemma Cansell、Stephen A. Hermitage
DOI:10.1039/b604130b
日期:——
Suitably ortho-substituted iodobenzenes act as organocatalysts for the transfer of electrophilic bromine from N-bromosuccinimide to alkenes via the intermediacy of bromoiodinanes.
Electrochemical bromolactonization of alkenoic acids with carbon tetrabromide: Synthesis of bromomethylated γ-lactones
作者:Kyeong Seop Kim、Dae Young Kim
DOI:10.1080/00397911.2022.2028843
日期:2022.2.1
Abstract Electrochemical radical bromination and cyclization sequences of alkenoicacids developed in this study. This approach is environmental-friendly by using carbon tetrabromide as a bromine radical precursor. The electrochemical protocol offers a facile way to prepare bromomethylated γ-lactones derivatives in moderate to high yields.