A biomimetic type expedient approach to the tricyclic core of xyloketals. Application to a short, stereocontrolled synthesis of alboatrin and a remarkable epi to natural isomerisation
作者:Debayan Sarkar、Subrata Ghosh、Ramanathapuram V. Venkateswaran
DOI:10.1016/j.tetlet.2009.01.086
日期:2009.4
An expedientsynthesis of the linear tetrahydrofurano benzopyran ring system of xyloketals is described involving an ortho ester Claisen rearrangement and an intramolecular cationic cyclisation. This strategy was applied for a short, stereocontrolled and high yield synthesis of the phytotoxic metabolite alboatrin.
Hypophosphite mediated carbon–carbon bond formation: total synthesis of epialboatrin and structural revision of alboatrin
作者:Stephen R. Graham、John A. Murphy、Alan R. Kennedy
DOI:10.1039/a907032j
日期:——
1-Ethylpiperidine hypophosphite (1-EPHP) has been used in the key radical-cyclisation step in a 6-step synthesis of the phytotoxic metabolite alboatrin and its epimer from orcinol. The synthesis demonstrates that the stereochemistry of the structure initially proposed for alboatrin requires revision.