Synlett 2005(15): 2333-2334  
DOI: 10.1055/s-2005-872267
LETTER
© Georg Thieme Verlag Stuttgart · New York

A Metal-Free Catalytic Aerobic Aromatization of Hantzsch 1,4-Dihydro­pyridines by N-Hydroxyphthalimide

Bing Han, Qiang Liu, Zhengang Liu, Ruizhu Mu, Wei Zhang, Zhong-Li Liu*, Wei Yu*
National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, P. R. China
Fax: +86(931)8625657; e-Mail: yuwei@lzu.edu.cn;
Further Information

Publication History

Received 12 June 2005
Publication Date:
03 August 2005 (online)

Abstract

4-Alkyl- and 4-aryl-Hantzsch 1,4-dihydropyridines were oxidized to the corresponding pyridine derivatives in excellent yields by molecular oxygen using N-hydroxyphthalimide (NHPI) as the catalyst.