Determination of absolute configurations of β- or γ-methyl substituted secondary alcohols by NMR spectroscopy
作者:Haruko Takahashi、Makoto Iwashima、Kazuo Iguchi
DOI:10.1016/s0040-4039(98)02344-2
日期:1999.1
determining the absolute configurations of acyclic β- or γ-methyl substituted secondary alcohols using their 2NMA esters. The 1H-NMR spectra of (R)- and (S)-2NMA esters of model compounds were measured, and Δδ values (δR-ester - δS-ester) for the corresponding protons were compared between syn and anti compounds. Threshold values important for judging the relative stereochemistry of the two chiral centers
已经开发出一种新方法,用于使用2NMA酯测定无环β-或γ-甲基取代的仲醇的绝对构型。的1的H-NMR谱([R )-和(小号)测量模型化合物的-2NMA酯和Δδ值(δ R-酯- δ S-酯),用于相应的质子之间比较顺式和反化合物。获得了对于判断两个带有甲基和羟基的手性中心的相对立体化学重要的阈值。如MTPA方法那样,容易基于Δδ值的符号来确定带有仲羟基的手性中心的绝对构型,因此在本研究中,也可以清楚地确定带有甲基的手性中心的绝对构型。团体。