Copper(II)-catalyzed [2,3]-sigmatropic rearrangement of N-methyltetrahydropyridinium ylids
Heath, P., Roberts, E., Sweeney, J.B., Wessel, H.P. and Workman, J.A. (2003) Copper(II)-catalyzed [2,3]-sigmatropic rearrangement of N-methyltetrahydropyridinium ylids. Journal of Organic Chemistry, 68 (10). pp. 4083-4086. ISSN 0022-3263
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To link to this article DOI: 10.1021/jo034147v
A ring-contractive and highly diastereoselective [2,3]-sigmatropic rearrangement occurs when N-methyl-1,2,3,6-tetrahydropyridine is treated with sub-stoichiometric amounts of copper or rhodium salts, in the presence of ethyl diazoacetate, giving ethyl cis-N-methyl-3-ethenyl proline (4).
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