Volume 56, Issue 9 pp. 2592-2603
Article

Sequential Intramolecular Diels–Alder Reaction of 3-Heteroaryl-2-propenylamides of Ethenetricarboxylate

Hirotaka Sugiura

Hirotaka Sugiura

Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1-1, Nakaku, Sakai, Osaka, 599-8531 Japan

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Shoko Yamazaki

Corresponding Author

Shoko Yamazaki

Department of Chemistry, Nara University of Education, Takabatake-cho, Nara, 630-8528 Japan

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Akiya Ogawa

Akiya Ogawa

Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1-1, Nakaku, Sakai, Osaka, 599-8531 Japan

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First published: 18 August 2019
Citations: 3

Abstract

The reaction of 1,1,2-ethenetricarboxylic acid 1,1-diethyl ester with E-3-(2-furyl)-2-propenylamines under the amide condensation conditions (EDCI/HOBt/Et3N) on heating at 80–110°C afforded cis-fused tricyclic compounds, furo[2,3-f]isoindoles as major product. On the other hand, the reaction with E-3-(3-furyl)-2-propenylamines afforded trans-fused tricyclic compounds predominantly. The formation of amide/[4 + 2] cycloaddition/hydrogen-shift reactions proceed sequentially. The observed stereoselectivity of the fused rings has been investigated by the density functional theory calculations. The reaction of 1,1,2-ethenetricarboxylic acid 1,1-diethyl ester with 3-(3-pyridinyl)-2-propen-1-amine under the amide condensation conditions afforded HOBt-incorporated 3,4-trans-pyrrolidine selectively. The chemoselectivity and stereoselectivity of the reactions with (3-heteroaryl)-2-propen-1-amines depend on the nature of heteroarenes.

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