Synthesis of 1‐(3
<i>H</i>
)isobenzofuranone compounds by tin powder promoted cascade condensation reaction
作者:Shangxian Wang、Ke‐Hu Wang、Bo Chang、Danfeng Huang、Yulai Hu
DOI:10.1002/aoc.6249
日期:2021.7
An efficient approach for the construction of phthalide compounds is developed through tin powder mediated cascade condensation reaction of 2-formylbenzoic acids with allyl bromides or α-bromoketone under mild reaction conditions. This method is easy to operate and can tolerate various functional groups to give the corresponding phthalides in good to excellent yields. The phthalides produced from α-bromoketone
通过锡粉介导的 2-甲酰基苯甲酸与烯丙基溴或α-溴酮在温和反应条件下的级联缩合反应,开发了一种有效的邻苯二甲酸酯化合物构建方法。该方法操作简单,可以耐受各种官能团,从而以良好到极好的收率得到相应的邻苯二甲酸酯。由α-溴酮生产的邻苯二甲酸酯可进一步转化为3,3a -dihydro -8 H -pyrazolo [5, l - a ]isoindol-8-one和8 H -pyrazolo[5, l- a ]isoindol-8-一。
Photoredox-Catalyzed Acyl Lactonization of Alkenes with Aldehydes: Synthesis of Acyl Lactones
作者:Wei-Hao Rao、Qi Li、Li-Li Jiang、Ying-Ge Li、Pan Xu、Xue-Wan Deng、Ming Li、Guo-Dong Zou、Xinhua Cao
DOI:10.1021/acs.joc.2c01732
日期:2022.11.4
An acyl lactonization of alkenes with aldehydes under visible-light photoredox catalysis is described. With the protocol, a broad scope of alkenoic acids and aldehydes could be compatible and good functional group tolerance is obtained. A series of acyl lactones are obtained with isolated yields ranging from 50–95%. Mechanistic studies revealed that the transformation should proceed via a radical chain
Visible‐Light Photoredox‐Catalyzed Acyl Lactonization of Alkenes with Acyl Chlorides
作者:Wei‐Hao Rao、Qi Li、Ying‐Ge Li、Li‐Li Jiang、Ming‐Xiao Yue、Guo‐Dong Zou、Xinhua Cao
DOI:10.1002/ejoc.202300191
日期:2023.5.8
A photocatalytic acyl lactonization of alkenoic acids with simple and inexpensive acyl chlorides has been developed for a modular synthesis of acyl lactones. The protocol allows an efficient construction of biologically important phthalide framework, which features excellent yields, good functional group tolerance and broad substrate scope. Preliminary mechanistic investigations revealed that the transformation
Direct Aerobic Oxidative Reactions of 2-Hydroxyacetophenones
作者:Subas Chandra Sahoo、Utpal Nath、Subhas Chandra Pan
DOI:10.1002/ejoc.201700909
日期:2017.8.17
Metal-free and external-oxidant-free aerobicoxidative reactions of 2-hydroxyacetophenones are developed. The reactions are based on the aerobic formation of small equilibrium quantities of 2-keto aldehydes. Phthalides, quinoxalines, α-ketoamides, and olefins can be formed in moderate to good yields directly from alcohols. DIPEA = diisopropylethylamine.