Design, synthesis and antifungal activities of novel pyrrole alkaloid analogs
摘要:
A series of novel analogs of pyrrole alkaloid were designed and synthesized by a facile method and their structures were characterized by H-1 NMR, C-13 NMR and high-resolution mass spectrometry (HRMS). The structure of compound 2a was identified by 2D NMR including heteronuclear multiple-quantum coherence (HMQC), heteronuclear multiple-bond correlation (HMBC) and H-H correlation spectrometry (H-H COSY) spectra. Their antifungal activities against five fungi were evaluated, and the results indicated that some of the title compounds showed moderate fungicidal activities in vitro against Alternaria solani, Cercospora arachidicola, Fusarium omysporum, Gibberella zeae and Physalospora piricola at the dosage of 50 mu g mL(-1). Compound 2a and 3a exhibited good activities against P. piricola at low dosage. (C) 2011 Elsevier Masson SAS. All rights reserved.
作者:Shashi Shashi、Mulla Althafh Hussain、Faiz Ahmed Khan
DOI:10.1055/s-0039-1690025
日期:2019.12
The first total synthesis of enisorine D, a natural product isolated from the marine sponge Iotrochota cf. iota, is described in 64% overall yield. The target molecule, which is an inhibitor of T3SS-dependent Yope secretion of Y. pseudotuberculosis, is achieved in seven linear steps from tyramine via simple and effective transformations that include bromination, acylation, alkylation, azidation, reduction
Gatekeeping Ketosynthases Dictate Initiation of Assembly Line Biosynthesis of Pyrrolic Polyketides
作者:Dongqi Yi、Atanu Acharya、James C. Gumbart、Will R. Gutekunst、Vinayak Agarwal
DOI:10.1021/jacs.1c02371
日期:2021.5.26
Assembly line biosynthesis of polyketidenaturalproducts involves checkpoints where identities of thiotemplated intermediates are verified before polyketide extension reactions are allowed to proceed. Determining what these checkpoints are and how they operate is critical for reprogramming polyketide assembly lines. Here we demonstrate that ketosynthase (KS) domains can perform this gatekeeping role
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。
Renneberg, Bernd; Kellner, Michael; Laatsch, Hartmut, Liebigs Annalen der Chemie, 1993, # 8, p. 847 - 852