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.
Colonge; Gelin, Bulletin de la Societe Chimique de France, 1954, p. 799
作者:Colonge、Gelin
DOI:——
日期:——
Design and Synthesis of Novel Xyloketal Derivatives and Their Vasorelaxing Activities in Rat Thoracic Aorta and Angiogenic Activities in Zebrafish Angiogenesis Screen
A novel series of xyloketal derivatives (1-21) were designed and prepared. The majority of the compounds demonstrated vasorelaxation action on 60 mM KCl-induced contractions rat isolated aortic rings in a concentration-dependent manner, and the action is mediated by both endothelium-independent and endothelium-dependent mechanisms. Compounds 9, 12, 13, 14, 15, and 19 showed higher vasorelaxation activities comparing with the lead compound 3. In addition, these derivatives had potential protective action against oxLDL-induced endothelial oxidative injury and enhanced NO production in HUVECs without toxic effects. The NO release was completely inhibited by eNOS inhibitor L-NAME. Furthermore, 3 significantly promoted the angiogenesis in zebrafish in a concentration-dependent manner at 0.1, 1, and 10 mu M. Compounds 9, 12, 14, 16, 20, and 21 exhibited stronger angiogenic activities than 3. Therefore, xyloketal derivatives are unique compounds with multiple pharmacological properties and may have potential implications in the treatment of cardiovascular diseases.
Total Synthesis of (±)-Xyloketal D and Model Studies towards the Total Synthesis of (-)-Xyloketal A
作者:Peter D. Wilson、Jeremy D. Pettigrew、Jason A. Bexrud、Rebecca P. Freeman