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Alkynyl triazenes enable divergent syntheses of 2-pyrones

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Abstract

The 2-pyrone motif occurs frequently in bioactive natural products and is appreciated as synthetic intermediates. However, only few methods allow for diversifying functional group modifications on this relevant heterocycle. The distinct properties of 1-alkynyl triazenes promote a smooth addition of propiolic acids across the triple bond. Addition of catalytic amounts of silver salt induces cyclization to 2-pyrones. Depending on the reaction temperature, either 6-triazenyl or 5-triazenyl 2-pyrones are selectively formed. The triazenyl unit is subsequently replaced by a variety of valuable groups in a one-pot process yielding for instance 2-fluoro pyrones. The substitution occurs with an intriguing 1,5-carbonyl transposition. Moreover, the triazenyl group serves as traceless activating group for subsequent Diels–Alder cycloadditions and as a constituting unit for rare fused aminopyrazole pyrone heterocycles.

Graphical abstract: Alkynyl triazenes enable divergent syntheses of 2-pyrones

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Article information


Submitted
10 May 2021
Accepted
03 Jun 2021
First published
04 Jun 2021

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2021, Advance Article
Article type
Edge Article

Alkynyl triazenes enable divergent syntheses of 2-pyrones

J. Tan, C. T. Bormann, K. Severin and N. Cramer, Chem. Sci., 2021, Advance Article , DOI: 10.1039/D1SC02583J

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