Infrared spectra and theoretical study of methyl, formyl and acetyl derivatives of chromones
摘要:
The C=O stretching frequencies of substituted 2-methylchromones (3a-3j). 2-formylchromones (4a-4j), 3-formylchromones (5a-5j) and 3-acetyl-2-methylchromones (6a-6i) were measured in CCl4 and CHCl3 and correlated with sigma+ substituent constants. Using the results of the infrared spectral investigation and the theoretical calculations by the semiempirical AM1 method, the conformation and the transmission of electronic effects in compounds 4-6 were studied. For the 2-substituted chromone system the transmission factory gamma according to the definition of Charton was determined. The preparation of some new 2-methylchromones (3e-3j) and 3-(2,2-diformyl-chlorovinyl)-6-methylchromone (7) is also described.
Design, synthesis and biological evaluation of thiazolyl-halogenated pyrroles or pyrazoles as novel antibacterial and antibiofilm agents
作者:Yuanchen Zhong、Huan Liu、Feifei Chen、Qian He、Xiaofei Zhang、Lefu Lan、Chunhao Yang
DOI:10.1016/j.ejmech.2024.116221
日期:2024.3
The formation of biofilm is one of the important factors for bacteria to develop drug-resistant. A series of halogenated-pyrroles or pyrazoles containing thiazole groups as antibacterial agents were designed and synthesized to target biofilms. Among them, compound showed antibacterial activity against various Gram-positive bacteria, particularly against vancomycin-resistant (MIC ≤0.125 μg/mL). Additionally
生物膜的形成是细菌产生耐药性的重要因素之一。设计并合成了一系列含有噻唑基团的卤代吡咯或吡唑作为抗菌剂,以针对生物膜。其中,化合物对多种革兰氏阳性菌均表现出抗菌活性,特别是对万古霉素耐药菌(MIC≤0.125 μg/mL)。此外,该化合物在亚 MIC 剂量下可显着抑制生物膜形成。此外,与吡咯霉素 C 相比,该化合物表现出显着较低的哺乳动物细胞毒性,并且还评估了其在不同物种中的肝微粒体代谢稳定性。进一步的感染模型实验证明该化合物是有效的。
Rosenmund; Schnurr, Justus Liebigs Annalen der Chemie, 1928, vol. 460, p. 89
作者:Rosenmund、Schnurr
DOI:——
日期:——
Synthesen von Heterocyclen. 19. Mitt.
作者:E. Ziegler、H. Junek
DOI:10.1007/bf00901134
日期:——
v. Auwers; Mauss, Justus Liebigs Annalen der Chemie, 1928, vol. 464, p. 304
作者:v. Auwers、Mauss
DOI:——
日期:——
Karale; Pawar; Gadakh, Indian Journal of Heterocyclic Chemistry, 2014, vol. 23, # 3, p. 283 - 292