Synthesis of Enantiopure Aliphatic Acetylene Alcohols and Determination of Their Absolute Configurations by1H NMR Anisotropy and/or X-ray Crystallography
作者:Satoshi Sekiguchi、Megumi Akagi、Junpei Naito、Yoko Yamamoto、Hiromi Taji、Shunsuke Kuwahara、Masataka Watanabe、Yoshiki Ozawa、Koshiro Toriumi、Nobuyuki Harada
DOI:10.1002/ejoc.200800012
日期:2008.5
MαNP esters (22b–27b). The absolute configurations of the first-eluted esters were determined from the distribution of Δδ values in the MαNP sector rule. In the case of MαNP ester 26b, the assigned absolute configuration was confirmed by X-ray crystallography. The solvolysis of MαNP esters yielded enantiopure acetylene alcohols 5–8 with established absolute configurations. (© Wiley-VCH Verlag GmbH &
MαNP 酸法已应用于外消旋脂肪族乙炔醇,以同时制备对映纯醇并通过 1H NMR 各向异性确定它们的绝对构型。外消旋乙炔醇 6–8、11 和 20 与 MαNP 酸 (S)-(+)-1 酯化,得到非对映异构 MαNP 酯,通过硅胶高效液相色谱法将其有效分离,分离因子 α 范围为 1.60–1.93。1H NMR 各向异性因子 Δδ [= δ(2nd fr.) – δ(1st fr.)] 由第一个 (22a–27a) 和第二个洗脱的 MαNP 酯 (22b–27b) 的数据计算得出。首先洗脱的酯的绝对构型由 MαNP 扇区规则中 Δδ 值的分布确定。在 MαNP 酯 26b 的情况下,指定的绝对构型由 X 射线晶体学证实。MαNP 酯的溶剂分解产生对映纯乙炔醇 5-8,具有确定的绝对构型。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim,