Scope of the directed dihydroxylation: application to cyclic homoallylic alcohols and trihaloacetamides
作者:Timothy J. Donohoe、Lee Mitchell、Michael J. Waring、Madeleine Helliwell、Andrew Bell、Nicholas J. Newcombe
DOI:10.1039/b303081d
日期:——
The synthesis and directed dihydroxylation of a range of cyclic alkenes was investigated. Both homoallylic alcohols and homoallylic trihaloacetamides were found to be efficient directing groups, giving rise to good to excellent levels of remote asymmetric induction with OsO4–TMEDA. Interestingly, in all cases examined, trifluoroacetamides were found to be superior to trichloroacetamides as directing groups and an argument is presented which rationalises this observation.
研究了一系列环状烯烃的合成及其定向双羟化反应。发现同烯丙醇和同烯丙三氟乙酰胺都是有效的导向基团,可以与OsO4–TMEDA体系一起实现良好的至优异的远程不对称诱导。有趣的是,在所有研究的情况下,三氟乙酰胺都被发现优于三氯乙酰胺作为导向基团,并提出了一个解释这一观察的合理论据。