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Trends in Organic Chemistry   Volumes    Volume 18 
Abstract
Oxidative aromatization and N-oxidation of 1,2,3,4-tetrahydroquinoline and -isoquinoline derivatives using sodium tungstate in the presence of activated carbon-molecular oxygen
Yoshinobu Tagawa, Masaru Inagaki
Pages: 97 - 100
Number of pages: 4
Trends in Organic Chemistry
Volume 18 

Copyright © 2017 Research Trends. All rights reserved

ABSTRACT
 
1,2,3,4-tetrahydroquinoline and -isoquinoline derivatives were oxidatively aromatized to the corresponding quinolines or isoquinolines and oxygenated to the corresponding quinolines or isoquinoline N-oxides in moderate yields using molecular oxygen as an oxidant and sodium tungstate as a catalyst in the presence of activated carbon in MeOH or xylenes. The present oxidation process revealed the importance of activated carbon, without which the oxidation would not proceed. Additionally, it serves as an example of an environmentally benign oxidative process conducted using molecular oxygen in place of harmful metal oxidants like CrO3, Pb(OAc)4, or Hg(OAc)2.
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