Diastereoselective Syntheses of Chroman Spiroketals via [4 + 2] Cycloaddition of Enol Ethers and <i>o-</i>Quinone Methides
作者:Maurice A. Marsini、Yaodong Huang、Christopher C. Lindsey、Kun-Liang Wu、Thomas R. R. Pettus
DOI:10.1021/ol8003244
日期:2008.4.1
A variety of chroman spiroketals are synthesized via inverse-demand [4 + 2] cycloaddition of enolethers and ortho-quinone methides (o-QMs). Low temperature o-QM generation in situ allows for the kinetic, diastereoselective construction of these motifs, providing entry to a number of unusual chroman spiroketal natural products.
A Cycloaddition Strategy for Use toward Berkelic Acid, an MMP Inhibitor and Potent Anticancer Agent Displaying a Unique Chroman Spiroketal Motif
作者:Thomas Pettus、Yaodong Huang
DOI:10.1055/s-2008-1072750
日期:2008.5
A kinetically controlled diastereoselective cycloaddition between a chiral enol ether and an ortho-quinone methide (o-QM) produces a chroman spiroketal motif that is found in the core of berkelic acid, a novel matrix metalloproteinase (MMP) inhibitor and potent anticancer agent. The transformation lays the groundwork for preparation of future inhibitors aimed at distinguishing among the active sites
Unified Total Syntheses of (−)-Medicarpin, (−)-Sophoracarpan A, and (±)-Kushecarpin A with Some Structural Revisions
作者:Zhen-Gao Feng、Wen-Ju Bai、Thomas R. R. Pettus
DOI:10.1002/anie.201408910
日期:2015.2.2
The total syntheses of medicarpin, sophoracarpan A, and kushecarpin A from a common intermediate are achieved by using ortho‐ and para‐quinone methide chemistry. Additionally, the relative stereochemistry of sophoracarpan A and B have been reassigned.