A Concise Total Synthesis of 2-epi-(–)-Pachastrissamine via a Three-Component Tandem Cross-Metathesis–Intramolecular SN2′ Substitution–Cross-Metathesis Sequence
作者:Dongjoo Lee
DOI:10.1055/s-0032-1317484
日期:——
A highly concise and efficient total synthesis of 2- epi -(–)-pachastrissamine is described utilizing a three-component tandem cross-metathesis–intramolecular S N 2′ substitution–cross-metathesis from the readily available alcohol (+)- 8 , wherein the substituted tetrahydrofuran formation and alkyl-chain extension are both accomplished in a one-pot manner. This route allows for direct access to pachastrissamines
Concerning directed oxidation and transacylation during a general approach to hydroxylated lactams
作者:Jeremy Robertson、Emilia Abdulmalek
DOI:10.1016/j.tetlet.2009.03.084
日期:2009.7
A variant of Knight’s route to d-mannolactam, exploring the stereoselectivity of directed oxidation conditions, reveals a tendency for hydroxylated N-tosyl lactams to rearrange to γ-lactones. An attempted directed dihydroxylation in this series is shown to result in unexpectedly high anti-selectivity.