Synlett 2016; 27(13): 2029-2033
DOI: 10.1055/s-0035-1562432
letter
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Trifluoromethyl-Substituted Ethyl Picolinate Derivatives by the Cobalt-Catalyzed Regioselective Intermolecular [2+2+2] Cycloaddition

Autoren

  • Tomoki Ishikawa

    Department of Chemistry, College of Humanities & Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan   eMail: kawatsur@chs.nihon-u.ac.jp
  • Taro Sonehara

    Department of Chemistry, College of Humanities & Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan   eMail: kawatsur@chs.nihon-u.ac.jp
  • Shogo Murakami

    Department of Chemistry, College of Humanities & Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan   eMail: kawatsur@chs.nihon-u.ac.jp
  • Maki Minakawa

    Department of Chemistry, College of Humanities & Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan   eMail: kawatsur@chs.nihon-u.ac.jp
  • Motoi Kawatsura*

    Department of Chemistry, College of Humanities & Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan   eMail: kawatsur@chs.nihon-u.ac.jp
Weitere Informationen

Publikationsverlauf

Received: 23. April 2016

Accepted after revision: 09. Mai 2016

Publikationsdatum:
14. Juni 2016 (online)


Graphical Abstract

Abstract

We demonstrated the intermolecular [2+2+2] cycloaddition of aryl- and trifluoromethyl-substituted internal alkyne and ethyl cyano­formate, and succeeded in constructing the pyridine derivatives using the CoI2/dcype/Zn catalyst system. The reaction proceeded with a high regioselectivity, and two trifluoromethyl-substituted ethyl picolinate derivatives were obtained as a single regioisomer.

Supporting Information