Tetrahedron Letters p. 9047 - 9050 (1995)
Update date:2022-08-22
Topics:
Davison, Edwin C.
Holmes, Andrew B.
Forbes, Ian T.
Intramolecular hydroxylamine-alkyne cyclisation of the hydroxylamines 8 and 9 afforded six-membered cyclic nitrones which without isolation underwent a tandem intramolecular dipolar cycloaddition to produce the tricyclic isoxazolidines 6 and 7 respectively.These were converted in two steps into the ladybird defence alkaloids (+/-)-euphococcinine 4 and (+/-)-adaline 5.
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