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Cp2TiCl in Natural Product Synthesis

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Radicals in Synthesis II

Part of the book series: Topics in Current Chemistry ((TOPCURRCHEM,volume 264))

Abstract

The synthesis of complex natural products constitutes one of the most exigent tests to prove the usefulness of a new reagent or catalyst. During the past 10 years, methods based on the Cp2TiCl -promoted and/or -catalyzed radical epoxide opening have been used by several authors as the key step for the synthesis of more than 50 natural products and advanced synthons. At first, owing to its selectivity and the extremely mild experimental conditions employed, stoichiometric Cp2TiCl was chosen for deoxygenation and reductive epoxide opening on densely functionalized substrates, but during the last 5 years catalytic Cp2TiCl has been increasingly employed to achieve radical cyclizations of different epoxyalkenes and epoxyalkynes, affording straightforward strategies for the synthesis of complex natural products. In these fields Cp2TiCl -based methods have already largely proved their synthetic usefulness but other Cp2TiCl-mediated reactions have as yet been scarcely applied. This review focuses on the increasing scope of applications that employ the Cp2TiCl -mediated procedures in the synthesis of natural products. We also present the basic concepts of these methods to facilitate and encourage further synthetic applications.

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Abbreviations

col:

2,4,6-Collidine

Cp:

Cyclopentadienyl

DMP:

Dess–Martin periodinane

m-CPBA:

3-Chloroperbenzoic acid

min:

Minutes

Py:

Pyridine

THF:

Tetrahydrofuran

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Acknowledgments

We are grateful to the “Junta de Andalucia” for the financial support to our research group (FQM339), including the project from the “Consejería de la Presidencia” (AM43/04). J.J. thanks the University of Granada and J.L.O.-L. the Spanish Ministry of Education and Science for their grants.

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Correspondence to J. Enrique Oltra .

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Cuerva, J.M., Justicia, J., Oller-López, J.L., Oltra, J.E. Cp2TiCl in Natural Product Synthesis. In: Gansäuer, A. (eds) Radicals in Synthesis II. Topics in Current Chemistry, vol 264. Springer, Berlin, Heidelberg. https://doi.org/10.1007/128_025

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