The SO3H-tethered imidazolium and triazolium salts, nonvolatile and recyclable Brønstedacidicionicliquids, efficiently mediate intramolecular hydroalkoxylations of alkenyl alcohols. They have been successfully employed in the synthesis of (±)-centrolobine.
SO 3 H系咪唑鎓盐和三唑鎓盐,不挥发且可回收的布朗斯台德酸性离子液体,可有效介导链烯醇的分子内加氢烷氧基化反应。它们已成功地用于合成(±)-中心洛宾。
Niobium-Catalyzed Intramolecular Addition of O–H and N–H Bonds to Alkenes: A Tool for Hydrofunctionalization
A convenient, versatile, and easy to handle intramolecular hydrofunctionalization of alkenes (C–O and C–N bonds formation) is reported using a novel niobium-based catalytic system. This atom economic and eco-friendly methodology provides an additional synthetic tool for the straightforward formation of valuable building blocks enabling molecular complexity. Various pyran, furan, pyrrolidine, piperidine
Intramolecular Additions of Alcohols and Carboxylic Acids to Inert Olefins Catalyzed by Silver(I) Triflate
作者:Cai-Guang Yang、Nicholas W. Reich、Zhangjie Shi、Chuan He
DOI:10.1021/ol051065f
日期:2005.10.1
[reactions: see text] Intramolecular additions of hydroxyl or carboxyl groups to inert olefins catalyzed by simple silver(I) triflate are described. Good to excellent yields can be obtained for a range of substrates under relatively mild conditions. This reaction represents one of the simplest methods to construct cyclic ethers or lactones.
Palladium-complex-catalyzed reactions of ketenes with allylic carbonates or acetates. Novel syntheses of .alpha.-allylated carboxylic esters and 1,3-dienes