Efficient synthesis of optically active 1-(2-carboxymethyl-6-ethylphenyl)-1H-pyrrole-2-carboxylic acid: a novel atropisomeric 1-arylpyrrole derivative
作者:Ferenc Faigl、Bernadett Vas-Feldhoffer、Miklós Kubinyi、Krisztina Pál、Gábor Tárkányi、Mátyás Czugler
DOI:10.1016/j.tetasy.2009.01.010
日期:2009.1
An efficient synthesis and resolution of (±)-1-(2-carboxymethyl-6-ethylphenyl)-1H-pyrrole-2-carboxylic acid has been developed for the preparation of novel optically active atropisomers. The ee values were measured by a 1H NMR spectroscopic method using quinidine as the chiral complexing agent. Absolute configurations of the separated enantiomers were determined using single crystal X-ray diffraction
已经开发了一种有效的合成和拆分(±)-1-(2-羧甲基-6-乙基苯基)-1H-吡咯-2-羧酸的方法,用于制备新型旋光性阻转异构体。ee值是使用奎尼丁作为手性络合剂通过1 H NMR光谱法测定的。分别使用对映体纯的二羧酸的二钠盐和(R)-1-苯基乙胺盐的单晶X射线衍射测量来确定分离的对映体的绝对构型。借助TD-DFT量子化学计算对CD光谱进行分析,确认了构型的分配。