Synthesis 2022; 54(10): 2480-2486
DOI: 10.1055/a-1731-9464
paper

FeCl3-Promoted Facile Synthesis of Multiply Arylated Nicotinonitriles

Kento Iwai
a   School of Environmental Science and Engineering, Kochi University of Technology, Kami, Kochi 782-8502, Japan
b   Research Center for Molecular Design, Kochi University of Technology, Kami, Kochi 782-8502, Japan
,
Haruka Yamauchi
a   School of Environmental Science and Engineering, Kochi University of Technology, Kami, Kochi 782-8502, Japan
,
Soichi Yokoyama
a   School of Environmental Science and Engineering, Kochi University of Technology, Kami, Kochi 782-8502, Japan
b   Research Center for Molecular Design, Kochi University of Technology, Kami, Kochi 782-8502, Japan
c   SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
,
a   School of Environmental Science and Engineering, Kochi University of Technology, Kami, Kochi 782-8502, Japan
b   Research Center for Molecular Design, Kochi University of Technology, Kami, Kochi 782-8502, Japan
› Author Affiliations


Abstract

Many biologically active nicotinonitriles have been reported to date. Consequently, the development of synthetic methods for multiply arylated/alkylated nicotinonitriles remains a sought-after field of research. In the present work, a new synthetic strategy for multi-substituted nicotinonitriles is described. A FeCl3-promoted condensation–cyclization reaction of an enamino nitrile and α,β-unsaturated ketones proceeded efficiently with a wide range of substrates. It is noteworthy that this method facilitates access to fully and differently substituted nicotinonitriles, including tetra-arylated nicotinonitriles, in only three steps. Using the functionality of the cyano group, the copper-catalyzed annulation reaction of the nicotinonitrile was achieved to yield benzo­[c][2,7]naphthyridin-5(6H)-one.

Supporting Information



Publication History

Received: 09 December 2021

Accepted after revision: 05 January 2022

Accepted Manuscript online:
05 January 2022

Article published online:
09 February 2022

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