急性肺损伤(ALI)是一种炎症介导的呼吸道疾病,死亡率很高。I 期和 II 期临床试验已证明含有抗炎小分子的药物可显着降低 ALI 死亡率。在这项研究中,设计、合成了两个系列的兰硫酰胺类似物,并评估了其治疗 ALI 的抗炎活性。我们发现化合物8n通过抑制LPS诱导的Raw264.7细胞中促炎细胞因子白细胞介素6(IL-6)和白细胞介素1β(IL-1β)的表达并激活Nrf2/HO表现出最佳的抗炎活性。 -1途径。此外,我们在LPS诱导的ALI小鼠模型中发现,化合物8n显着减少炎症细胞向肺组织的浸润,从而达到保护肺组织和改善ALI的效果。此外,我们的小鼠模型研究表明,化合物8n具有良好的祛痰作用。这些结果一致支持兰硫酰胺类似物8n代表了一类新型抗炎药,有潜力作为先导化合物进一步开发为治疗 ALI 的治疗药物。
Metal-free hydration of aromatic haloalkynes to α-halomethyl ketones
作者:Min Ye、Yuelu Wen、Huifang Li、Yejuan Fu、Qinghao Wang
DOI:10.1016/j.tetlet.2016.09.088
日期:2016.11
A highly regioselective and efficient metal-free hydration of aromatic haloalkynes to α-halomethyl ketones using cheap tetrafluoroboric acid as catalyst is described. The protocol is conducted under convenient conditions and affords products in good to excellent yields, with broad substrate scope, including a variety of aromatic alkynyl chlorides, alkynyl bromides, and alkynyl iodides.
Highly efficient and recyclable catalyst for the direct chlorination, bromination and iodination of terminal alkynes
作者:Wei Shi、Zhipeng Guan、Peng Cai、Hao Chen
DOI:10.1016/j.jcat.2017.07.019
日期:2017.9
Direct halogenation, including chlorination, bromination and iodination of terminalalkynes, are of great importance in organic synthesis. Here an efficient and recyclable nano-Ag/g-C3N4 catalyst system was developed and proved to be remarkably active with 39 examples varied from chlorination, bromination to iodination, of which 14 runs have yielded more than 95% of the product. Recycling of the catalyst
直接卤化,包括末端炔烃的氯化,溴化和碘化,在有机合成中非常重要。在此,开发了一种有效且可循环利用的纳米Ag / gC 3 N 4催化剂体系,并证明其具有显着的活性,从氯化,溴化到碘化的39种实例中,有14种的收率超过了95%。在几次运行后,也实现了催化剂的再循环而没有明显的活性损失:即使在苯乙炔的溴化过程中进行了5次运行,也观察到99%的收率。该催化剂系统成本低廉且易于制备,使得该方法通用,方便且经济。
Efficient synthesis of 1-iodoalkynes <i>via</i> Al<sub>2</sub>O<sub>3</sub> mediated reaction of terminal alkynes and <i>N</i>-iodosuccinimide
作者:Ming Yao、Jingjing Zhang、Sen Yang、Hangxing Xiong、Li Li、E. Liu、Hong Shi
DOI:10.1039/d0ra00251h
日期:——
Iodination of terminalalkynes using N-iodosuccinimide (NIS) in the presence of γ-Al2O3 was developed to afford 1-iodoalkynes with good to excellent yields (up to 99%). This described approach featured excellent chemoselectivity, good functional group tolerance, and utilization of an inexpensive catalyst.
开发了在 γ-Al 2 O 3存在下使用N-碘代琥珀酰亚胺 (NIS) 对末端炔进行碘化,以提供良好至优异产率(高达 99%)的 1-碘炔。这种方法具有优异的化学选择性、良好的官能团耐受性以及使用廉价催化剂的特点。
Au(I)‐Catalyzed Hydration of 1‐Iodoalkynes Leading to α‐Iodoketones
作者:Alberto Gómez‐Herrera、Ishfaq Ibni Hashim、Marre Porré、Fady Nahra、Catherine S. J. Cazin
DOI:10.1002/ejoc.202001238
日期:2020.11.22
The Au(I)‐catalyzedhydration of 1‐iodoalkynes is reported, using a gold(I)–NHC catalyst. A variety of α‐iodomethyl ketones are thus accessed in good to excellent yields. Several sequential protocols were also developed, leading to the construction of molecular complexity.