Synthesis of 6-Acylmethylphenanthridine Enaminones

H. Loghmani-Khouzani^a,, R. Gawinecki^b, M.M. Sadeghi^a, H. Mehrabia and B. Osmialowski^b*

^aDepartment of Chemistry, Faculty of Sciences, University of Isfahan, 81746-73441 IR Iran
^bDepartment of Chemistry, Technical and Agricultural University, Seminaryjna 3 PL-85-326 Bydgoszcz, Poland

A series of 6-acylmethylphenanthridine derivatives were synthesized by reaction of aliphatic and aromatic esters with 6-methylphenanthridine in the presence of phenyllithium. Enaminone form of the obtained compounds was investigated by spectroscopic methods. The results revealed that the presence of aromatic rings on 3- and 4-position of 2-acylmethylquinolines (6-acylmethylphenanthridines) is the most important factor for the preference of the enaminone form b. It was found that the intramolecular hydrogen bonding is the only factor that can damage aromaticity of the phenanthridine moiety.

Keywords: Phenanthridine; Enaminone, 2-Ketomethylquinolines, Tautomerism, Hydrogen bonding, Aromaticity

Synthesis of 6-Acylmethylphenanthridine Enaminones

H. Loghmani-Khouzania,*, R. Gawineckib, M.M. Sadeghia, H. Mehrabia and B. Osmialowskib

aDepartment of Chemistry, Faculty of Sciences, University of Isfahan, 81746-73441 IR Iran bDepartment of Chemistry, Technical and Agricultural University, Seminaryjna 3 PL-85-326 Bydgoszcz, Poland

H. Loghmani-Khouzani^a,, R. Gawinecki^b, M.M. Sadeghi^a, H. Mehrabia and B. Osmialowski^b*

^aDepartment of Chemistry, Faculty of Sciences, University of Isfahan, 81746-73441 IR Iran
^bDepartment of Chemistry, Technical and Agricultural University, Seminaryjna 3 PL-85-326 Bydgoszcz, Poland