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An iron-catalysed C–C bond-forming spirocyclization cascade providing sustainable access to new 3D heterocyclic frameworks

Adams, Kirsty, Ball, Anthony K., Birkett, James, Brown, Lee, Chappell, Ben, Gill, Duncan M., Lo, P. K. Tony, Patmore, Nathan J., Rice, Craig R., Ryan, James, Raubo, Piotr and Sweeney, Joseph B. (2016) An iron-catalysed C–C bond-forming spirocyclization cascade providing sustainable access to new 3D heterocyclic frameworks. Nature Chemistry, 9 (4). pp. 396-401. ISSN 1755-4330

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Abstract

Heterocyclic architectures offer powerful creative possibilities to a range of chemistry end-users. This is particularly true of heterocycles containing a high proportion of sp3-carbon atoms, which confer precise spatial definition upon chemical probes, drug substances, chiral monomers and the like. Nonetheless, simple catalytic routes to new heterocyclic cores are infrequently reported, and methods making use of biomass-accessible starting materials are also rare. Here, we demonstrate a new method allowing rapid entry to spirocyclic bis-heterocycles, in which inexpensive iron(III) catalysts mediate a highly stereoselective C–C bond-forming cyclization cascade reaction using (2-halo)aryl ethers and amines constructed using feedstock chemicals readily available from plant sources. Fe(acac)3 mediates the deiodinative cyclization of (2-halo)aryloxy furfuranyl ethers, followed by capture of the intermediate metal species by Grignard reagents, to deliver spirocycles containing two asymmetric centres. The reactions offer potential entry to key structural motifs present in bioactive natural products.

Item Type: Article
Subjects: Q Science > QD Chemistry
Schools: School of Applied Sciences
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Depositing User: Joseph Sweeney
Date Deposited: 12 May 2017 08:58
Last Modified: 12 May 2017 08:58
URI: http://eprints.hud.ac.uk/id/eprint/31855

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