Hydrophobic `lock and key' recognition of <i>N</i>-4-nitrobenzoylamino acid by strychnine
作者:Agata Białońska、Zbigniew Ciunik
DOI:10.1107/s0108768106025249
日期:2006.12.1
acid. In the crystal structure of (2a) and (3a), the protonated amine N atom is a donor of hydrogen bonds, while the hydroxyl group of the serine derivative and water molecules are their acceptors. In light of the hydrophobic recognition, chiral discrimination depends on the nature of the hydrogen-bond networks, which involve anions, solvent molecules and the protonated amine N atom of strychninium cations
在通过士丁宁盐的分步结晶进行外消旋N-4-硝基苯甲酰基-DL-氨基酸(丙氨酸,丝氨酸和天冬氨酸)的过程中,两种非对映异构体盐的晶体均生长,而士丁宁N-4-硝基苯甲酰-的晶体结构也得以生长。 L-丙氨酸盐二溶剂化物甲醇(1a),士兰碱N-4-硝基苯甲酰基-D-丙氨酸二水合物(1b),士兰碱N-4-硝基苯甲酰基-D-丝氨酸二水合物(2a),士茅碱N-4-硝基苯甲酰基-L-丝氨酸盐甲醇测定了溶剂合物水合物(2b),N-4-硝基苯甲酰基-L-天冬氨酸的士丁酸氢3.75水合物(3a)和N-4-硝基苯甲酰基-D-天冬氨酸2.25的士丁烷氢的水合物(3b)。炔属阳离子形成波纹状的层,由氢键结合的阴离子和溶剂分子隔开。瓦楞纸层的共同特征是在它们的表面上有很深的疏水性凹槽,被合适的阴离子的4-硝基苯甲酰基占据。士的宁自组装的深沟中氨基酸衍生物的4-硝基苯甲酰基的疏水“锁定”和“键”识别使所得到的表面具有更强