3-[5-(4-Chlorophenyl)-1-(4-methoxyphenyl)-1<i>H</i>-pyrazol-3-yl]propionic acid and the corresponding methyl ester
作者:Isuru R. Kumarasinghe、Victor J. Hruby、Gary S. Nichol
DOI:10.1107/s010827010900941x
日期:2009.4.15
The synthesis of 3‐[5‐(4‐chlorophenyl)‐1‐(4‐methoxyphenyl)‐1H‐pyrazol‐3‐yl]propionic acid, C19H17ClN2O3, (I), and its corresponding methyl ester, methyl 3‐[5‐(4‐chlorophenyl)‐1‐(4‐methoxyphenyl)‐1H‐pyrazol‐3‐yl]propionate, C20H19ClN2O3, (II), is regiospecific. However, correct identification of the regioisomer formed by spectroscopic techniques is not trivial and single‐crystal X‐ray analysis provided
3-[5-(4-氯苯基)-1-(4-甲氧基苯基) -1H-吡唑-3-基]丙酸,C 19 H 17 ClN 2 O 3,(I)及其相应的合成甲酯,3-[5-(4-氯苯基)-1-(4-甲氧基苯基)-1 H-吡唑-3-基]丙酸甲酯,C 20 H 19 ClN 2 O 3,(II),是区域特异性的。然而,通过光谱技术正确识别形成的区域异构体并非易事,单晶 X 射线分析提供了明确结构确定的唯一手段。化合物 (I) 与Z结晶' = 2. 两个晶体学独特分子的丙酸基团形成氢键二聚体,这是固态羧酸基团的典型特征。甲氧基苯和吡唑环之间的构象差异产生了两个独特的分子。(II) 的结构在不对称单元中仅具有一个分子,并且晶体堆积比 (I) 更能利用弱 C-H... A相互作用,尽管缺乏用于经典氢键的任何官能团。