A General and Nonempirical Approach to the Determination of the Absolute Configuration of 1-Aryl-1,2-diols
作者:Stefano Superchi、Daniele Casarini、Carmela Summa、Carlo Rosini
DOI:10.1021/jo035803u
日期:2004.3.1
coupling method, to assign the absolute configuration of the benzylic stereogenic center of 1-aryl-1,2-diols. According to this method, it is only necessary to prepare the 4-biphenylboronic esters of the diols and to record their CD spectra in the 230−300 nm range, i.e., in the range corresponding to the long-axis 1La transition of the biphenyl chromophore. From the sign of the CD couplet or Cotton effect
我们在此基于激子偶联方法描述一种简单,通用且可靠的非经验方法,以分配1-芳基-1,2-二醇的苄基立体异构中心的绝对构型。根据该方法,仅需制备二醇的4-联苯硼酸酯并记录其在230-300 nm范围内(即在对应于长轴1 L a的范围内)的CD光谱联苯发色团的过渡。从260 nm处的CD偶联或棉花效应的征兆,可以知道由芳基和联苯发色团跃迁定义的手性,然后确定苄基碳的绝对构型。通过这种方法,已经制定了简单的规则,使我们能够建立许多种类的1-芳基-1,2-二醇的绝对构型。