Stereocontrolled entry to the tricyclo[3.3.0]oxoheptane core of bielschowskysin by a [2+2] cycloaddition of an allene-butenolide
作者:Ru Miao、Subramanian G. Gramani、Martin J. Lear
DOI:10.1016/j.tetlet.2009.01.131
日期:2009.4
As part of ongoing transannulation studies, the practical synthesis of an allene-linked gamma-butenolide from L-malic acid and its substrate-controlled [2+2] photocycloaddition to the tricyclic core of bielschowskysin (1) are described. (C) 2009 Elsevier Ltd. All rights reserved.
Progress toward the Total Synthesis of Bielschowskysin: A Stereoselective [2 + 2] Photocycloaddition
作者:Brandon Doroh、Gary A. Sulikowski
DOI:10.1021/ol0530225
日期:2006.3.2
The tetracyclic core of the diterpene bielschowskysin has been prepared as a single enantiomer via a stereoselective intramolecular [2 + 2] photocycloaddition of 5-alkylidene-2(5H)-furanone 3.
A Palladium-Catalyzed Carbo-oxygenation: The Bielschowskysin Case
An asymmetric synthesis of an advanced tetracyclic intermediate toward the synthesis of bielschowskysin (1) Is described. A biomimetic [2 + 2]-photocyclization was used to establish the cyclobutane core of bielschowskysin. Macrocyclization under Heck conditions led to an unprecedented carbo-oxygenation of a 1,1-disubstituted double bond.
Synthetic studies on polymaxenolides: model studies for constructing dihydropyran portion and synthesis of lower portion
With a goal of the total synthesis of polymaxenolide, the first hybrid marine natural product, the model studies for constructing the dihydropyran portion based on the originally proposed biosynthesis (C-C bond formation followed by dehydrative cyclization) and the synthesis of the lower portion (the C1-C3, C7-C17 portion) based on an iodide-induced Morita-Baylis-Hillman type reaction (a three-component assembly) followed by Suzuki-Miyaura cross-coupling are described. (C) 2014 Elsevier Ltd. All rights reserved.