9-Phenyl-10-methylacridinium: A Highly Efficient and Reusable Organocatalyst for Mild Aromatization of 1,4-Dihydropyridines by Molecular Oxygen
Xinqiang Fang, You-Cheng Liu* and Chaozhong Li
*Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China, Email: ycliuustc.edu.cn
X. Fang, Y.-C. Liu, C. Li, J. Org. Chem., 2007, 72, 8608-8610.
A mild, efficient, and general aromatization of Hantzsch 1,4-dihydropyridines with oxygen was realized at room temperature with 5 mol % of 9-phenyl-10-methylacridinium perchlorate as photocatalyst, which could be easily recovered and reused.
see article for more examples
Pyridines, Oxygen, Organocatalysis