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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Towards a general solid phase approach for the iterative synthesis of conjugated oligomers using a germanium based
David J Turner1, Rémi Anémian, Philip R Mackie
1Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, UK S3 7HF. david.x.turner@gsk.com
Abstract:
The development of a germanium-based linker system for the solid phase synthesis (SPS) of 3-(n-hexyl)thiophene oligomers and the first SPS of triarylamine oligomers via iterative chain extension is described. The efficiency of the key steps in the oligomer syntheses and their compatibility with the germanium linker are demonstrated by the SPS of bi-[3-(n-hexyl)thiophene] 19 and ter-(triarylamine) 50. The use of a germanium-based linker in combination with appropriately selected silicon-based blocking/protecting groups allows double coupling to drive the key cross coupling steps to completion hence minimising deletion sequences and also allows for traceless and potentially functionalisative cleavage from the resin. The latter feature has yet to be fully explored but towards this end the first ipso-borodegermylation reaction of a 2-germyl-3-(n-hexyl)thiophene is presented.
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