A tandem synthesis of (±)-euphococcinine and (±)-adaline
摘要:
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.
Palladium-Catalyzed Intramolecular Iodine-Transfer Reactions in the Presence of β-Hydrogen Atoms
作者:Brendan M. Monks、Silas P. Cook
DOI:10.1002/anie.201308534
日期:2013.12.23
Atom economy: A palladium‐catalyzed atom‐transfer reaction of secondary alkyl iodides is described. An intramolecular double insertion of an alkyne and olefin provides access to primary iodides possessing β‐hydrogenatoms. The process delivers these complex bicyclic homoallylic iodides with tetrasubstituted olefins from easily accessible aliphatic iodides. Different functional groups, including common
A tandem synthesis of (±)-euphococcinine and (±)-adaline
作者:Edwin C. Davison、Andrew B. Holmes、Ian T. Forbes
DOI:10.1016/0040-4039(95)01908-z
日期:1995.12
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.