Synthesis of Enantiopure Aliphatic Acetylene Alcohols and Determination of Their Absolute Configurations by1H NMR Anisotropy and/or X-ray Crystallography
A general method for the synthesis of enantiopure aliphatic chain alcohols with established absolute configurations. Part 2, via catalytic reduction of acetylene alcohol MαNP esters
separated by HPLC on silica gel, and their absoluteconfigurations were unambiguously determined by 1H NMR as reported in the Part 1 paper. The MαNP esters obtained with established absoluteconfigurations were catalytically hydrogenated to yield saturated alcohol MαNP esters. It was evidenced that no racemization occurred at the stereogenic center of the alcohol moiety during catalytic hydrogenation,
用于合成对映体纯(100%ee)的既定的绝对构型的脂族醇的一般方法已被开发并应用于醇CH 3(CH 2)Ñ -CH(OH) - (CH 2)米CH 3,其中的对映体歧视是最困难的,如果米 = ñ + 1和ñ大。外消旋饱和短链醇可以直接作为enantioresolved(小号) - (+) - 2-甲氧基-2-(1-萘基)丙酸(MαNP酸)在硅胶上通过酯HPLC,和它们的绝对构型中,同时确定通过11 H NMR抗磁各向异性。然而,这种强大的MαNP酯法与长链醇的应用是困难的,因为分离系数α的较小值的。在这样的情况下,使用相应的炔属醇MαNP酯是至关重要的。乙炔醇MαNP酯主要是由HPLC分离在硅胶上,它们的绝对构型通过明确地确定11 H NMR在第1部分纸作为报道。既定绝对构型获得的MαNP酯进行催化加氢,得到饱和醇MαNP酯。据证实,没有发生外消旋化在醇部分的催化氢化过程中立体中心,通