关键词: 核磁共振（NMR）, 香豆素[3,4]吡啶酮衍生物, 结构确证, 红外光谱（IR）, 质谱（MS）

Abstract:

Coumarin-3,4-pyridone derivatives are a novel class of aromatic heterocyclic compounds based on the coumarin scaffold. This work presents a new synthetic method for the preparation of coumarin-3,4-pyridone derivatives. The infrared absorption spectrum, mass spectrum (MS), and nuclear magnetic resonance (NMR) spectra, including ¹H NMR, ¹³C NMR, DEPT135, COSY, HSQC and HMBC, were measured and analyzed. The characteristic absorption peaks in the IR spectra were assigned to their corresponding functional groups, and the signals in the ¹H and ¹³C NMR spectra were interpreted and assigned, thereby confirming the structure of the coumarin-3,4-pyridone derivatives. This study provides a reference for further research on coumarin-3,4-pyridone derivatives.

Key words: Nuclear magnetic resonance (NMR), coumarin-3,4-pyridone derivative, structural eleucidation, infrared spectrum (IR), mass spectrometry (MS)