Phenylselenoetherification of some Δ4-alkenols facilitated by pyridine and some Lewis acids
作者:Biljana M. Šmit、Zorica M. Bugarčić
DOI:10.1002/jhet.487
日期:2010.11
Studies on the phenylselenoetherification of some Δ4‐alkenols in the presence of pyridine and some Lewis acids are described. All alkenols underwent intramolecular cyclization yielding corresponding tetrahydrofuran or tetrahydropyran derivatives. Yield and diastereomeric ratio of the cyclic products depend on counterion of selenylating reagent used. We found that external additives, such as pyridine
研究一些Δ的phenylselenoetherification 4个在吡啶存在-alkenols和一些路易斯酸说明。所有烯醇都进行分子内环化,得到相应的四氢呋喃或四氢吡喃衍生物。环状产物的产率和非对映异构体比例取决于所用硒化试剂的抗衡离子。我们发现,外部添加剂,例如吡啶和一些与亲电子和/或亲核物质配位的路易斯酸,可用于高效控制环化过程并提高立体诱导水平。J.杂环化学。(2010)。