Synthesis 2018; 50(06): 1368-1372
DOI: 10.1055/s-0036-1591738
paper
© Georg Thieme Verlag Stuttgart · New York

A New, Simple, and General Synthesis of N-Oxides of Iodopyridines and Iodoquinolines via the Diazotization–Iodination of Heterocyclic Amino N-Oxides in the Presence of p-Toluenesulfonic Acid in Water

Authors

  • Elena A. Krasnokutskaya*

    Department of Biotechnology and Organic Chemistry, National Research Tomsk Polytechnic University, 634050 Tomsk, Russian Federation   eMail: eak@tpu.ru
  • Alexey A. Chudinov

    Department of Biotechnology and Organic Chemistry, National Research Tomsk Polytechnic University, 634050 Tomsk, Russian Federation   eMail: eak@tpu.ru
  • Victor D. Filimonov

    Department of Biotechnology and Organic Chemistry, National Research Tomsk Polytechnic University, 634050 Tomsk, Russian Federation   eMail: eak@tpu.ru

The research was funded by the Tomsk Polytechnic University Competitiveness Enhancement Program grant, Project Number VIU-TOVPM-316/2017. EAK thanks RFBR grant 17-03-01097.
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Publikationsverlauf

Received: 10. Oktober 2017

Accepted after revision: 15. November 2017

Publikationsdatum:
13. Dezember 2017 (online)


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Abstract

The diazotization of a series of N-oxides of aminopyridines and aminoquinolines under the action of sodium nitrite in the presence of KI and p-TsOH in water at room temperature leads to the formation of the corresponding N-oxides of iodopyridines and iodoquinolines in high yields. The method has a general character and can be used for the preparation of 3-, 2-, and 4- N-oxides of iodopyridines.

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