Biomimetic type approach to the tricyclic core of xyloketals. Application to a short, stereocontrolled synthesis of alboatrin and first synthesis of xyloketal G
作者:Debayan Sarkar、Ramanathapuram V. Venkateswaran
DOI:10.1016/j.tet.2011.04.084
日期:2011.6
benzopyran ring system of xyloketals is described. An orthoester Claisen rearrangement of a chromenol and an intra-molecular cationic cyclization are the key steps in the synthesis. A short, stereocontrolled and high yield synthesis of the phytotoxic metabolite alboatrin was achieved employing this strategy. A unique case of Lewis acid catalyzed isomerization of epi-alboatrin to alboatrin was observed.
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.
A New and Efficient Method for <i>o</i>-Quinone Methide Intermediate Generation: Application to the Biomimetic Synthesis of (±)-Alboatrin
作者:Raphaël Rodriguez、Robert M. Adlington、John E. Moses、Andrew Cowley、Jack E. Baldwin
DOI:10.1021/ol048479d
日期:2004.9.1
[reaction: see text] A new and efficient method for o-quinonemethide intermediate generation from o-methyleneacetoxy-phenols has been developed and applied to the biomimetic synthesis of (+/-)-Alboatrin.
A new and efficient method for o-quinone methide intermediate generation: application to the biomimetic synthesis of the benzopyran derived natural products (±)-lucidene and (±)-alboatrin
作者:Raphaël Rodriguez、John E. Moses、Robert M. Adlington、Jack E. Baldwin
DOI:10.1039/b508972g
日期:——
involve a hetero Diels-Alder cycloaddition between an o-quinonemethide intermediate with a simple, or activated tri-substituted olefin. Experimental evidence is provided to support this hypothesis, with the biomimetic synthesis of both (+/-)-lucidene and (+/-)-alboatrin successfully achieved using a new and efficient method for o-quinonemethidegeneration.
Total synthesis of alboatrin, a phytotoxic metabolite from Verticillium alboatrum
作者:Bidyut Biswas、Debayan Sarkar、Ramanathapuram V. Venkateswaran
DOI:10.1016/j.tet.2008.01.097
日期:2008.3
A synthesis of the phytotoxic metabolite alboatrin 1 is described. An intramolecular ketene-olefin cycloaddition followed by an oxidative ring enlargement was employed to generate the tricyclic ring system. (c) 2008 Elsevier Ltd. All rights reserved.