A Highly Efficient Procedure for Ruthenium Tetroxide Catalyzed Oxidative Cyclizations of 1,5-Dienes
作者:Stefanie Roth、Sabrina Göhler、Huan Cheng、Christian B. W. Stark
DOI:10.1002/ejoc.200500052
日期:2005.10
for the oxidative cyclization of 1,5-dienes, which generally allows for high yields and selectivities. A solid-supported terminal oxidant and a finely tuned solvent mixture have both been identified as critical factors for this high efficiency. As little as 0.2 mol-% ruthenium(III) chloride as a pre-catalyst for the ruthenium tetroxide generated in situ is required to accomplish oxidative cyclization
我们报告了一种用于 1,5-二烯氧化环化的高效程序,该程序通常允许高产率和选择性。固体负载的末端氧化剂和微调的溶剂混合物都被认为是实现这种高效率的关键因素。需要低至 0.2 mol% 的氯化钌 (III) 作为原位生成的四氧化钌的预催化剂来完成氧化环化。这种极低的催化剂负载量、高非对映选择性、温和的反应条件和简单的后处理程序是该工艺的关键特征。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)