Nitrone dipolar cycloaddition routes to piperidines and indolizidines part 10 - Investigation of conjugate addition/intramolecular nitrone dipolar cycloadditions and their use in the synthesis of dendrobatid alkaloid precursors

Reference:

Horsley, H. T., Holmes, A. B., Davies, J. E., Goodman, J. M., Silva, M. A., Pascu, S. I. and Collins, I., 2004. Nitrone dipolar cycloaddition routes to piperidines and indolizidines part 10 - Investigation of conjugate addition/intramolecular nitrone dipolar cycloadditions and their use in the synthesis of dendrobatid alkaloid precursors. Organic and Biomolecular Chemistry, 2 (8), pp. 1258-1265.

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Official URL:

http://dx.doi.org/10.1039/b402307b

Abstract

The sequential intramolecular conjugate addition of the oxime 13 followed by intramolecular dipolar cycloaddition of the intermediate nitrone 14 affords a mixture of the isoxazolidines 15, 16 and 17. The tricyclic 6,5,5-adduct 15 is believed to be the product of kinetic control and can be equilibrated with the epimeric tricyclic 6,5,5-isoxazolidine 17 through a beta-elimination/conjugate addition process. Conditions have been developed for the two-step conversion of the ketone 12 under thermodynamic control into the racemic tricyclic 6,6,5-adduct 16 which is the core precursor of all the known histrionicotoxin alkaloids.

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