Synlett 2018; 29(04): 483-488
DOI: 10.1055/s-0036-1590961
letter
© Georg Thieme Verlag Stuttgart · New York

An Efficient Cyanide-Free Approach towards 1-(2-Pyridyl)isoquinoline-3-carbonitriles via the Reaction of 5-Phenacyl-1,2,4-triazines with 1,2-Dehydrobenzene in the Presence of Alkyl Nitrites

Dmitry S. Kopchuk
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
b   I. Ya. Postovskiy Institute of Organic Synthesis, Ural Division of the Russian Academy of Sciences, 22 S. Kovalevskoy Str., Yekaterinburg, 620219, Russian Federation
,
Alexey P. Krinochkin
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
,
Albert F. Khasanov
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
,
Igor S. Kovalev
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
,
Pavel A. Slepukhin
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
b   I. Ya. Postovskiy Institute of Organic Synthesis, Ural Division of the Russian Academy of Sciences, 22 S. Kovalevskoy Str., Yekaterinburg, 620219, Russian Federation
,
Ekaterina S. Starnovskaya
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
,
Anindita Mukherjee
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
,
Matiur Rahman
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
,
Grigory V. Zyryanov
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
b   I. Ya. Postovskiy Institute of Organic Synthesis, Ural Division of the Russian Academy of Sciences, 22 S. Kovalevskoy Str., Yekaterinburg, 620219, Russian Federation
,
Adinath Majee
c   Department of Chemistry, Visva-Bharati (A Central University), Santiniketan-731235, India
,
Vladimir L. Rusinov
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
b   I. Ya. Postovskiy Institute of Organic Synthesis, Ural Division of the Russian Academy of Sciences, 22 S. Kovalevskoy Str., Yekaterinburg, 620219, Russian Federation
,
Oleg N. Chupakhin
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
b   I. Ya. Postovskiy Institute of Organic Synthesis, Ural Division of the Russian Academy of Sciences, 22 S. Kovalevskoy Str., Yekaterinburg, 620219, Russian Federation
,
a   Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation   Email: sougatasantra85@gmail.com   Email: ssantra@urfu.ru
› Author Affiliations
We are pleased to acknowledge the Russian Science Foundation (Ref. # 16-43-02020) for funding. A. Majee acknowledges financial support from the DST-RSF Major Research Project (Ref. No. INT/RUS/RSF/P-08).
Further Information

Publication History

Received: 16 October 2017

Accepted: 24 October 2017

Publication Date:
28 November 2017 (online)


Abstract

A cyanide-free method for the preparation of 1-(2-pyridyl)isoquinoline-3-carbonitriles (3-cyanoisoquinolines) was developed. The interaction of 5-phenacyl-3-(2-pyridyl)-1,2,4-triazines with 1,2-dehydrobenzene generated in situ from anthranilic acid and an excess of amyl nitrites afforded the target compounds in good yields. The proposed mechanism involves the in situ transformation of the 5-phenacyl group into the 5-cyano group under the action of alkyl nitrite and the following inverse demand aza-Diels–Alder reaction of thus formed 5-cyano-1,2,4-triazines with 1,2-dehydrobenzene affording the target products. The presence of the 5-phenacyl substituent is a key for the reaction, as in case of 5-styryl- or 5-phenylethynyl-3-(2-pyridyl)-1,2,4-triazines the formation of the 1,2,4-triazine ring-transformation products was observed

Supporting Information

 
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