Intramolecular regioselective addition of radicals and carbanions to ynol ethers. A strategy for the synthesis of exocyclic enol ethers
作者:Rana Hanna、Benoit Daoust
DOI:10.1016/j.tet.2010.11.024
日期:2011.1
cyclization reactions involving halo ynol ethers have been investigated. 5-exo and 6-exo radical cyclizations of 6-iodo and 7-iodo ynol ethers proceeded well when the oxygen of the ynol ether was bearing an ethyl group. Exocyclic iodoenol ethers resulting from these cyclizations were highly unstable and decomposed rapidly. Li–I exchange of iodo ynol ethers proceeded smoothly at −78 °C. 6-Alkoxy-5-hexynyllithiums