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Article

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2016-08-23

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/164185

Regio- and stereoselective synthesis of acetallic tetrahydropyrans as building blocks for natural products preparation, via a tandem [4+3]-cycloaddition/ozonolysis Process

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https://doi.org/10.1002/ejoc.201600590

Abstract

A highly versatile synthetic pathway is presented for the preparation of polyfunctionalized acetallic tetrahydropyrans from conveniently substituted 1-methoxy-8-oxabicyclo[3.2.1]- oct-6-en-3-one derivatives, as intermediates in the total synthesis of natural and unnatural products with structural, functional and/or biological importance. This synthetic methodology involves two key steps: a [4 + 3] cycloaddition reaction between an oxyallyl cation and 2-methoxyfuran as a diene, followed by oxidative and/or reductive ozonolysis of the cycloheptenone subunit. This sequence renders polyfunctionalized 2-methoxytetrahydropyranic products capable of being easily opened under acidic conditions. The key steps, cycloaddition and subsequent ozonolysis were both fully studied under different reaction conditions and using several substrates in order to optimize yields and stereoselectivities and to study the scope of the methodology. It is noteworthy that both reactions proceed with high diastereoselectivity and, in the case of the oxidative ozonolysis, outstanding regioselectivity as well. A chemical library of 14 polyfunctionalized tetrahydrofurans, having five or seven stereocenters, has been prepared using the detailed approach.

Subject

Química orgànica, Ozó

Subject (English)

Organic chemistry, Ozone

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Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

Citation

MONTAÑA PEDRERO, Ángel-Manuel, et al. Regio- and stereoselective synthesis of acetallic tetrahydropyrans as building blocks for natural products preparation, via a tandem [4+3]-cycloaddition/ozonolysis Process. European Journal of Organic Chemistry. 2016. Vol. 2016, num. 27, pags. 4674-4695. ISSN 1434-193X. [consulted: 10 of August of 2026]. Available at: https://hdl.handle.net/2445/164185

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