Synthesis 2016; 48(19): 3232-3240
DOI: 10.1055/s-0035-1562443
paper
© Georg Thieme Verlag Stuttgart · New York

6-endo-dig Cycloisomerization of N-Propargyl Aminoquinoxalines: A New Route to 1,4,8-Triazaphenanthrenes

Authors

Further Information

Publication History

Received: 13 May 2016

Accepted after revision: 06 June 2016

Publication Date:
07 July 2016 (online)


Graphical Abstract

Preview

This paper is dedicated in the memory of Prof Jean F. Normant, a great mentor and a wonderful person.

‡ S.V. and G.L.D. contributed equally to this work.

Abstract

We report the preparation of novel 1,4,8-triazaphenanthrenes and show that the target compounds are efficiently obtained from the corresponding 6-aminoquinoxalines after N-propargylation followed by copper-catalyzed 6-endo-dig cycloisomerization and aromatization. The cyclization was found to be completely regioselective.

Supporting Information