Stereocontrolled entry to 2,5-disubstituted tetrahydrofurans from hex-2-enono-δ-lactones under mild conditions
摘要:
A stereospecific route to highly functionalized 2,5-disubstituted tetrahydrofuran derivatives from readily available 6-O-silylated-hex-2-enono-delta-lactones is reported. The protocol involves an efficient Michael type O-heterocyclization reaction followed by selective ring openig of the lactone moiety.
Chemoselective Activation of Diethyl Phosphonates: Modular Synthesis of Biologically Relevant Phosphonylated Scaffolds
作者:Pauline Adler、Amandine Pons、Jing Li、Jörg Heider、Bogdan R. Brutiu、Nuno Maulide
DOI:10.1002/anie.201806343
日期:2018.10
Phosphonates have garnered considerable attention for years owing to both their singular biological properties and their synthetic potential. State‐of‐the‐art methods for the preparation of mixed phosphonates, phosphonamidates, phosphonothioates, and phosphinates rely on harsh and poorly selective reaction conditions. We report herein a mild method for the modular preparation of phosphonylated derivatives
The amphiphilic diacetylenes with directly-bound aromatic substituents, i. e. 27-aryl-24,26-heptacosadiyn-1-ols and -diynoic acids, were synthesized and the solid-state polymerization of these compounds upon γ-ray and UV irradiation was investigated. More than half of the compounds synthesized are polymerizable because the packing effect of the methylene chains makes the diacetylene moieties align into
Fungicidal activity of truncated analogues of dihydrosphingosine
作者:Karin Thevissen、Ulrik Hillaert、Els M.K. Meert、Kuen K. Chow、Bruno P.A. Cammue、Serge Van Calenbergh、Isabelle E.J.A. François
DOI:10.1016/j.bmcl.2008.05.067
日期:2008.7
The minimal fungicidal concentration (MFC) of dihydrosphingosine (DHS), phytosphingosine (PHS), and five short-chain DHS derivatives was determined for Candida albicans and Candida glabrata. In this respect, a C15- and a C17-homologue of DHS showed a 2- to 10-fold decreased MFC as compared to native DHS (i.e. C18-DHS). DHS derivatives that were active, that is, comprising 12, 15, 17, or 18 carbon atoms