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。
and operationally‐simple process for the synthesis of 1‐iodoalk‐1‐ynes under mild conditions catalyzed by CuI/TBAB in waterunderair was developed in this study. Catalyst loadings of CuI as low as 1–2 mol% gave 1‐iodoalk‐1‐ynes in good to high yields, and the residual aqueous solution after extraction with hexane could be reused for the next reaction without any treatment.
A Highly Efficient Gold-Catalyzed Photoredox α-C(sp<sup>3</sup>)H Alkynylation of Tertiary Aliphatic Amines with Sunlight
作者:Jin Xie、Shuai Shi、Tuo Zhang、Nina Mehrkens、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201412399
日期:2015.5.11
A new α‐C(sp3)H alkynylation of unactivated tertiaryaliphaticamines with 1‐iodoalkynes as radical alkynylating reagents in the presence of [Au2(μ‐dppm)2]2+ in sunlight provides propargylic amines. Based on mechanistic studies, a CC coupling of an α‐aminoalkyl radical and an alkynyl radical is proposed for the C(sp3)C(sp) bond formation. The mild, convenient, efficient, and highly selective C(sp3)H
Redox and Lewis Acid Relay Catalysis: A Titanocene/Zinc Catalytic Platform in the Development of Multicomponent Coupling Reactions
作者:Joseph B. Gianino、Catherine A. Campos、Antonio J. Lepore、David M. Pinkerton、Brandon L. Ashfeld
DOI:10.1021/jo501890z
日期:2014.12.19
A titanocene-catalyzed multicomponent coupling is described herein. Using catalytic titanocene, phosphine, and zinc dust, zinc acetylides can be generated from the corresponding iodoalkynes to affect sequential nucleophilic additions to aromatic aldehydes. The intermediate propargylic alkoxides are trapped in situ with acetic anhydride, which are susceptible to a second nucleophilic displacement upon
Synthesis of 5
<i>H</i>
‐Selenopheno[3,2‐
<i>c</i>
]isochromen‐5‐ones Promoted by Dialkyl Diselenides and Oxone®
作者:Helen A. Goulart、José S. S. Neto、Angelita M. Barcellos、Thiago Barcellos、Márcio S. Silva、Diego Alves、Raquel G. Jacob、Eder J. Lenardão、Gelson Perin
DOI:10.1002/adsc.201900288
日期:2019.7.11
2‐c]isochromen‐5‐ones were obtained through a double intramolecular cyclization of methyl 2‐(organyl‐1,3‐diynyl)benzoate promoted by electrophilic species of selenium generated in situ by the reaction of dialkyl diselenides with Oxone®, using ethanol as solvent. The reactions were conducted satisfactorily under mild conditions, using a range of 1,3‐diynes and dialkyl diselenides as substrates. A total
我们在这里首次描述了与硒代苯酚融合的异色酮的合成。5 ħ -Selenopheno并[3,2- c ^ ]异色烯-5-酮是通过所产生的硒亲电子物质促进甲基(有机基-1,3-二炔基)苯甲酸甲酯2-双分子内环化得到原位通过反应使用乙醇作为溶剂,使用Oxone®制备二烷基二硒化物。反应在温和的条件下令人满意地进行,使用1,3-二炔和二烷基二硒化物作为底物。在敞口烧瓶中回流条件下,反应时间短(1.0-2.5),选择性地以中等至良好的收率(40-86%)选择性地获得了十六种前所未有的5 H-硒代苯并[3,2 - c ]异色素n -5- H)。
Catalytic Electrophilic Halogenation of Silyl-Protected and Terminal Alkynes: Trapping Gold(I) Acetylides<i>vs</i>. a Brønsted Acid-Promoted Reaction
作者:Pavel Starkov、Filippo Rota、Jarryl M. D'Oyley、Tom D. Sheppard
DOI:10.1002/adsc.201200491
日期:2012.11.26
presence of a cationic gold(I) catalyst and N-halosuccinimide, both trimethylsilyl-protected and terminalalkynes are converted into alkynyl halides. Further experiments showed that silyl-protected alkynes undergo electrophilic iodination and bromination under Brønsted acid catalysis, whilst terminalalkynes require a cationic gold catalyst. The former reactions probably proceed via activation of the