An improved procedure for phenylselenoetherification of some ?5-alkenols using pyridine, Ag2O, and some Lewis acids as catalysts
作者:Zorica M. Bugar?i?、Biljana M. Mojsilovi?
DOI:10.1002/hc.10227
日期:——
cyclization of some Δ5-alkenols, using PhSeX (X = Cl, Br) has been developed. We found that cyclization can be facilitated in the presence of pyridine, Ag2O, and some Lewis acids as catalysts. Thus catalytic amount of additives (pyridine and Ag2O) influences higher yields but equimolar amount achieves almost quantitative yield under extremely mild experimental conditions. In the presence of Lewis acids (ZnCl2
已经开发了使用 PhSeX (X = Cl, Br) 对某些 Δ5-烯醇进行分子内环化的改进程序。我们发现在吡啶、Ag2O 和一些路易斯酸作为催化剂的存在下可以促进环化。因此,催化量的添加剂(吡啶和 Ag2O)会影响更高的产率,但在极其温和的实验条件下等摩尔量可实现几乎定量的产率。在路易斯酸(ZnCl2 和 FeCl3)的存在下,以催化量获得高产率的环醚产物。© 2004 Wiley Periodicals, Inc. 杂原子化学 15:146–149, 2004; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002/hc.10227