Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 69, Issue 21, Pages 7171-7182Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo040193z
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- NIGMS NIH HHS [P50 GM067041] Funding Source: Medline
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The intramolecular inverse-electron-demand Diels-Alder reaction between imidazoles and 1,2,4-triazines linked by a trimethylene tether from the imidazole N1 position to the triazine C3 proceed in excellent yields to produce 1,2,3,4-tetrahydro-1,5-naphthyridines. The reaction proceeds by a cycloaddition with subsequent loss of nitrogen, followed by a presumed stepwise loss of a nitrile. The analogous intramolecular cycloadditions employing a tetramethylene tether also proceeded to give 2,3,4,5-tetrahydro-1H-pyrido[3,2-b]azepines in acceptable yields. The reaction to produce the tetrahydro-1,5-naphthyridines can also be promoted with microwave irradiation.
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