Synthesis of<i>exo</i>-Enamides from Protected Lactams Using a Modified Julia Olefination Reaction: Application to the Synthesis of Spiroaminal Fragments
作者:Nicolas Gigant、Samuel Habib、Marie Medoc、Peter G. Goekjian、David Gueyrard、Isabelle Gillaizeau
DOI:10.1002/ejoc.201402681
日期:2014.10
A modifiedJuliaolefination (Julia–Kocienski) reaction involving lactams has been developed, which gives the corresponding substituted exo-enamides in moderate to good yields. An application of this versatile transformation in the synthesis of spiroaminal fragments is also demonstrated.
已经开发了一种涉及内酰胺的改进的 Julia 烯化(Julia-Kocienski)反应,它以中等至良好的产率得到相应的取代外烯酰胺。还展示了这种多功能转化在螺旋氨基片段合成中的应用。
A Julia olefination approach to the synthesis of functionalized enol ethers and their transformation into carbohydrate-derived spiroketals
作者:Matthieu Corbet、Benjamin Bourdon、David Gueyrard、Peter G. Goekjian
DOI:10.1016/j.tetlet.2007.11.207
日期:2008.1
A synthesis of spiroketals from carbohydrate lactones is reported. A modifiedJuliaolefination is used to synthesize trisubstituted and highly functionalized exo-glycals, which were subsequently transformed into spiroketals under acidic conditions.
Synthesis of the spiroketal fragment of bistramide A via an exocyclic enol ether
作者:Loïc Tomas、David Gueyrard、Peter G. Goekjian
DOI:10.1016/j.tetlet.2010.06.006
日期:2010.9
An efficient synthesis of the spirocyclic fragment 1 of bistramides is reported. An olefination reaction of lactone 4 with sulfone 5 gave the enolether3, which upon cyclization in acidic media provided the spiroketal ring system. This compound was then converted into the C19–C36 fragment of the bistramides via successive Julia–Kocienski and Horner–Emmons olefinations.