Young Sup Kim

Efficient synthesis of novel α-aryl(alkyl)-β, β-difluorovinyl and α-aryl(alkyl)-β-fluoro-β-perfluoroalkylvinyl sulfides

Reaction of 1,1-vis(phenylthio)perfluoroalkyl aromatics or alkanes with a mixture of 2 equiv. of TiCl4 and 4 equiv. of LiAlH4 in THF at reflux temperature for 3 hours afforded α-aryl(alkyl)-β-fluoro-β-perfluoroalkylvinyl and α-aryl (alkyl)-β-fluoro-β-perfluoroalkylvinyl sulfides in good yields.

Antifungal Activity of Decursinol Angelate Isolated from Angelica gigas Roots Against Puccinia recondita

Rust causes significant losses in the yield and quality of various crops. The development of new effective and environmentally benign agents against the pathogen is of great interest. In the course of searching a natural antifungal compound from medicinal plants, we found that the methanol extract of Angelica gigas roots had a potent control efficacy against wheat leaf rust (WLR) caused by Puccinia recondita. The antifungal substance was isolated from the methanol extract by silica gel column chromatography, alumina column chromatography and C preparative HPLC. It was identified as decursinol angelate by EI-MS and H-NMR data. In in vivo test, decursinol angelate effectively suppressed the development of WLR and red pepper anthracnose (RPA) among the 6 plant diseases tested. In addition, the wettable powder-type formulation of ethyl acetate extract of A. gigas roots significantly suppressed the development of WLR. The crude extract containing decursinol angelate and the chemical appear to be a potential candidate for control of WLR. In addition, this is the first report on the in vivo antifungal activity of decursinol angelate against WLR as well as RPA.