The structure and tautomerism of N-(1-naphthyl)-3-amino-5-oxo-4-phenyl-1H-pyrazole-1-carboxamide with
antibacterial activity have been investigated with experimental approaches (X-ray studies, IR, 1H and 13C NMR spectra,
including NOESY and N-HSQC spectra) and quantum chemical calculations. It is found that the tautomer with the keto
group in position 5 is energetically privileged in the crystalline state while in DMSO and water solution the equilibrium is
shifted towards the form with the hydroxyl group at this position. These findings are related to antibacterial activity of the
studied compound and are crucial for future molecular docking and structure-activity relationship studies.
通过实验方法(X 射线研究、红外光谱、1H 和 13C NMR 光谱,包括 NOESY 和 N-HSQC 光谱)和量子
化学计算,研究了具有抗菌活性的 N-(1-
萘基)-3-
氨基-5-氧代-
4-苯基-1H-吡唑-1-甲酰胺的结构和同分异构体。研究发现,在结晶状态下,5 号位置带有酮基的同分异构体具有能量优势,而在
二甲基亚砜和
水溶液中,平衡则转向该位置带有羟基的形式。这些发现与所研究化合物的抗菌活性有关,对今后的分子对接和结构-活性关系研究至关重要。