Isocyanide-Based Multicomponent Reaction To Furnish N-Functionalized Indoles by using <i>N</i>
-Acyliminium Ions as Key Intermediates
作者:Guangsheng Cheng、Hongmei Deng、Xiang He、Yu Gao、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1002/ejoc.201700826
日期:2017.8.17
The present work discloses an efficient multicomponent reaction of isocyanide, allenoate, and indole. In the absence of any catalyst, this protocol provides a rapid and direct access to furnish N-H functionalization of indole from readily available starting materials. This strategy also features the broad substrate scope and mild conditions.
Isocyanide-Based Multicomponent Reactions: Concise Synthesis of Spirocyclic Oxindoles with Molecular Complexity by Using a [1,5]-Hydrogen Shift as the Key Step
作者:Shikuan Su、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1002/chem.201402576
日期:2014.5.12
concise multicomponentreaction of isocyanide, α‐substituted allenoate, and methyleneindolinone has been disclosed. This protocol provides a fast and straightforward approach to synthesize unusual tricyclic oxindoles in an efficient and atom‐economic manner. Mechanistically, the present cycloaddition may proceed through a cascadesequence involving double Michael addition, double cyclization, double
Iron-Catalyzed Aerobic Oxidation and Annulation Reaction of Pyridine and α-Substituted Allenoate toward Functionalized Indolizine
作者:Tao Jin、Zhongzhong Tang、Jie Hu、Hongdong Yuan、Yaoyao Chen、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/acs.orglett.7b03696
日期:2018.1.19
An iron-catalyzed reaction of pyridine and α-substituted allenoate has been disclosed. The present strategy incorporates the aerobic oxidation into annulation involving substituted allenoate, thus providing a new access to functionalized indolizine.
Synthesis of Substituted Coumarins via Brønsted Acid Mediated Condensation of Allenes with Substituted Phenols or Anisoles
作者:Sundae Kim、Dongjin Kang、Chang-Hee Lee、Phil Ho Lee
DOI:10.1021/jo301086k
日期:2012.8.3
Coumarins were obtained from the condensation of electron-rich arenes with allenes in the presence of TfOH in good yield. Depending on the substituent pattern of allenes employed, the general synthetic method of 4-substituted and 3,4-disubstituted 3-arylcoumarins has been developed. Readily available allenes were employed as the three-carbon atom sources constituting the coumarin skeleton.
Organocatalyzed [2+2] Cycloaddition Reactions between Quinone Imine Ketals and Allenoates
作者:Teng Liu、Chao Huang、Feixiang Cheng、Chixian He、Fan Wang、Xiang Shen、Yongqin Li、Man Lang、Guijun Li
DOI:10.1055/s-0040-1707292
日期:2021.2
Abstract A new cycloaddition reaction of quinone imine ketals (QIKs), which could be utilized to the construction of functionalized azaspirocyclics under mild conditions, is described. This transformation involved a [2+2] cycloaddition reactionbetween QIKs and allenoates catalyzed by DABCO, and then treatment with 1 N HCl in one-pot. The strategy could provide a practical route to access azetidine-fused