Toward a Total Synthesis of Amphidinolide X and Y. The Tetrahydrofuran-Containing Fragment C12−C21
作者:Carles Rodríguez-Escrich、Anna Olivella、Fèlix Urpí、Jaume Vilarrasa
DOI:10.1021/ol063035y
日期:2007.3.1
The key THF derivative (9a) for an enantioselective synthesis of amphidinolide X/Y was obtained from 1a via a selenoetherification reaction. In fact, among the cyclization methods investigated, the highest yield and stereocontrol were achieved at -78 degrees C with PhSeCl/EtiPr2N from diols 1a (anti-Z) and 1b (anti-E) and with PhSeCl/ZnBr2 from diols 1c (syn-Z) and 1d (syn-E). Also, surprisingly, use
通过硒醚化反应从1a获得用于对苯二酚内酯X / Y的对映选择性合成的关键THF衍生物(9a)。实际上,在所研究的环化方法中,使用二醇1a(抗Z)和1b(抗E)的PhSeCl / EtiPr2N以及使用二醇1c(syn)的PhSeCl / ZnBr2在-78℃时可获得最高的收率和立体控制。 -Z)和1d(syn-E)。同样,令人惊讶的是,在所研究的情况下,使用保护基(在烯丙基OH上)是有害的。多样的THF-四取代的立体异构体将提供一系列的两性霉素X / Y类似物。[结构:见文字]