5-Methyl-4H-1,3-dioxins, new chiral building blocks: transformation into (R)- and (S)-4-hydroxymethyl-4-methyl-1,3-dioxolanes via oxidation and rearrangement and determination of the absolute configuration
作者:Susanne Flock、Herbert Frauenrath、Carsten Wattenbach
DOI:10.1016/j.tetasy.2005.08.046
日期:2005.10
stereochemical course of this transformation has been studied, while the relative configuration of the intermediate oxidation product and the absolute configuration of the resulting camphanyl ester of 2-tert-butyl-4-hydroxymethyl-4-methyl-1,3-dioxolane was established by X-ray crystallography. From these results, the absolute configuration of the dioxins has been deduced.
5-甲基-4- ħ -1,3-二恶英通过不对称双键异构化获得的已经转变为4-羟甲基-4-甲基-1,3-二氧戊环由米氯过苯甲酸氧化,环收缩和减少。研究了这种转变的立体化学过程,同时确定了中间氧化产物的相对构型和所得的2-叔丁基-4-羟甲基-4-甲基-1,3-二氧戊环樟脑酯的绝对构型通过X射线晶体学。从这些结果,已经推断出二恶英的绝对构型。