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

Kirsty Adams, Anthony K. Ball, James Birkett, Lee Brown, Ben Chappell, Duncan M. Gill, P. K.Tony Lo, Nathan J. Patmore, Craig R. Rice, James Ryan, Piotr Raubo, Joseph B. Sweeney

Research output: Contribution to journalArticle

20 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)396-401
Number of pages6
JournalNature Chemistry
Volume9
Issue number4
Early online date12 Dec 2016
DOIs
Publication statusPublished - 1 Apr 2017

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