Towards novel difluorinated sugar mimetics; syntheses and conformational analyses of highly-functionalised difluorinated cyclooctenones
作者:Gerry A. Griffith、Jonathan M. Percy、Stéphane Pintat、Clive A. Smith、Neil Spencer、Emi Uneyama
DOI:10.1039/b505978j
日期:——
Highly-functionalised difluorinated cyclooctenones were synthesised from trifluoroethanol using either metallated difluoroenol acetal or carbamate chemistry, followed by a [2,3]-Wittig rearrangement or aldol reaction. Efficient RCM reactions afforded the title compounds which showed rather restricted fluxional behaviour by VT (19)F NMR. Topological characterisation by molecular modelling and NOESY/ROESY
使用金属化的二氟烯醇缩醛或氨基甲酸酯化学方法,由三氟乙醇合成高度官能化的二氟环辛烯酮,然后进行[2,3] -Wittig重排或羟醛反应。有效的RCM反应得到标题化合物,通过VT(19)F NMR显示出相当有限的通量行为。通过分子建模和NOESY / ROESY实验进行拓扑表征提出了许多挑战,但允许鉴定两个受青睐的船椅构象异构体,它们通过伪旋转相互转化,具有较大的激活屏障。