Asymmetric Catalysis; 138: Synthesis of Enantiomerically Pure 2-Pyridinyl-α-ethanols via Diastereomeric Camphanic Esters
作者:Henri Brunner、Darijo Mijolović、Manfred Zabel
DOI:10.1055/s-2001-16767
日期:——
The pure diastereomers were accessible by separating the diastereomeric esters with medium-pressure silica gel chromatography or fractional crystallization. X-ray structure analysis of the pure camphanic esters established the absolute configurations of the 2-pyridinyl-alcohols. The enantiomerically pure alcohols were obtained after saponification of the diastereomerically pure esters.
Synthesis 2001, No. 11, 28 08 2001。文章标识符:1437-210X,E;2001,0,11,1671,1680,ftx,en;Z04601SS.pdf。© Georg Thieme Verlag Stuttgart · New York ISSN 0039-7881 摘要:制备了基于2-吡啶-乙醇骨架的新型三齿面结合配体作为外消旋体。与对映体纯的 (-)-(1S,4R)-樟脑酰氯反应得到非对映体樟脑酯。通过用中压硅胶色谱法或分级结晶分离非对映体酯,可获得纯的非对映体。纯樟脑酯的 X 射线结构分析确定了 2-吡啶醇的绝对构型。在非对映异构纯酯皂化后获得对映异构纯醇。