study antifungal activities. In vitro and in vivo antifungal activity results revealed that compounds 2-25, which contain a γ-butyrolactone scaffold and cinnamic aldehyde moiety, have greater potent fungicidal activity than other compounds. The preliminary structure–activity relationships (SARs) demonstrated that compounds with electron-withdrawing groups and small steric hindrance would have more desirable
CO<sub>2</sub>-Activation for γ-Butyrolactones and Its Application in the Total Synthesis of (±)-Heteroplexisolide E
作者:Suhua Li、Shengming Ma
DOI:10.1002/asia.201200467
日期:2012.10
is described. The catalyst is highly active and can be applied for the synthesis of (optically active) mono‐ or bicyclic α‐alkylidene‐γ‐butyrolactones with excellent regio‐ and stereoselectivity and good functional group tolerance. The potential of the reaction has been demonstrated in the first synthesis of (±)‐heteroplexisolide E.
An Approach to the Total Synthesis of the Marine Ascidian Metabolite Perophoramidine via a Halogen-Selective Tandem Heck/Carbonylation Strategy
作者:Gerald D. Artman、Steven M. Weinreb
DOI:10.1021/ol034314d
日期:2003.5.1
A halogen-selective tandem intramolecular Heck/carbonylation reaction has been developed for the construction of the C,E,F-ring system and the C20 quaternary center found in perophoramidine (1). This process can be effected in good yields in the presence of both the chlorine and bromine atoms found in the natural product. In addition, it is possible to introduce the quaternary center at C4 in a stereoselective