Low Catalyst Loadings in Olefin Metathesis: Synthesis of Nitrogen Heterocycles by Ring-Closing Metathesis
作者:Kevin M. Kuhn、Timothy M. Champagne、Soon Hyeok Hong、Wen-Hao Wei、Andrew Nickel、Choon Woo Lee、Scott C. Virgil、Robert H. Grubbs、Richard L. Pederson
DOI:10.1021/ol9029808
日期:2010.3.5
A series of ruthenium catalysts have been screened under ring-closing metathesis (RCM) conditions to produce five-, six-, and seven-membered carbamate-protected cyclic amines. Many of these catalysts demonstrated excellent RCM activity and yields with as low as 500 ppm catalyst loadings. RCM of the five-membered carbamate series could be run neat, the six-membered carbamate series could be run at 1
已经在闭环复分解 (RCM) 条件下筛选了一系列钌催化剂,以生产五元、六元和七元氨基甲酸酯保护的环胺。许多这些催化剂表现出优异的 RCM 活性和低至 500 ppm 催化剂负载的产率。五元氨基甲酸酯系列的 RCM 可以在 1.0 M 下运行,六元氨基甲酸酯系列可以在 1.0 M 下运行,而七元氨基甲酸酯系列在 0.2-0.05 M 下运行效果最好。