Investigation of conjugate addition/intramolecular nitrone dipolar cycloadditions and their use in the synthesis of dendrobatid alkaloid precursorsNitrone dipolar cycloaddition routes to piperidines and indolizidines. Part 10. For part 9, see ref. 1.
作者:Helen T. Horsley、Andrew B. Holmes、John E. Davies、Jonathan M. Goodman、Mar�a A. Silva、Sofia I. Pascu、Ian Collins
DOI:10.1039/b402307b
日期:——
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