6-Substituted 2-azabicyclo[2.2.1]hept-5-enes by nitrogen-directed radical rearrangement: Synthesis of an epibatidine analogue with high binding affinity at the nicotinic acetylcholine receptor

Reference:

Hodgson, D. M., Maxwell, C. R., Wisedale, R., Matthews, I. R., Carpenter, K. J., Dickenson, A. H. and Wonnacott, S., 2001. 6-Substituted 2-azabicyclo[2.2.1]hept-5-enes by nitrogen-directed radical rearrangement: Synthesis of an epibatidine analogue with high binding affinity at the nicotinic acetylcholine receptor. Journal of the Chemical Society: Perkin Transactions 1

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Official URL:

http://dx.doi.org/10.1039/b107414h

Abstract

Base-induced isomerisation of epoxide 13 gives an azanortricyclanol 17 which is a precursor for a novel free-radical induced rearrangement to 6-substituted 2-azabicyclo[2.2. I]hept-5-enes 28-31. Compound 31 undergoes selective exo-face hydrogenation to give the 6-substituted 2-azabicyclo[2.2. I]heptane 33 (structure confirmed by X-ray crystallographic analysis). Deprotection of 33 gives epibatidine analogue 2 which has been shown to bind with high affinity at rat brain nicotinic acetylcholine receptors.

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