烟草烟雾中存在的一系列芳香胺(2-,3-和4-甲基苯胺,2,3-和2,4-二甲基苯胺)与DNA结合的能力已通过N-(酰氧基)芳基胺的反应进行了研究带有dG,dG核苷酸和DNA。通过光谱法和HPLC法将与dG和核苷酸反应的主要产物表征为N-(脱氧鸟苷-8-基)芳基胺。修饰DNA的HPLC和光谱分析表明相同的加合物。1 H和13 C NMR光谱的分析表明,含有在芳基胺氮上邻位的甲基取代基的加合物具有较高百分比的顺式构象异构体。这一观察结果得到理论模拟研究的支持,该研究表明低能同构异构体的百分比很高,并且随着取代模式的增加,其对位
copper-catalyzed [1,3]-methoxy rearrangement of N-methoxyanilines followed by Michael addition of nucleophiles to the in situ generated ortho-quinol imine. The present reaction exhibits excellent applicability of para-substituents, such as vinyl, methylthio, ester, and bromo, and carbon nucleophiles, such as 1,3,5-trimethoxybenzene, N-methylindole, and dimethyl malonate. Thus, the present rearrangement can resolve
Stereoselective Synthesis of Fully Substituted β-Lactams via Metal–Organo Relay Catalysis
作者:Long Chen、Kai Wang、Ying Shao、Jiangtao Sun
DOI:10.1021/acs.orglett.9b01255
日期:2019.5.17
A novel three-component reaction of N-hydroxyanilines, enynones, and diazo compounds has been developed via a metal–organo relay catalysis, providing highly functionalized β-lactams containing two quaternary carbon centers in good yields and with excellent diastereoselectivities. This protocol features a sequential reaction of Rh-catalyzed imine formation, Wolff rearrangement, and benzoylquinine-catalyzed
Rhodium-Catalyzed C═N Bond Formation through a Rebound Hydrolysis Mechanism and Application in β-Lactam Synthesis
作者:Long Chen、Linxing Zhang、Ying Shao、Guangyang Xu、Xinhao Zhang、Shengbiao Tang、Jiangtao Sun
DOI:10.1021/acs.orglett.9b01312
日期:2019.6.7
this transformation proceeds via a novel rebound hydrolysis mechanism. Furthermore, a three-component reaction was explored to synthesize highly functionalized β-lactams in good yields and diastereoselectivities.
A method for reducing a substrate selected from 2-methyl-5-nitropyridine and methyl 4-(2-fluoro-3-nitrobenzyl)piperazine-1-carboxylate is provided catalysed by a nitroreductase and a disproportionation agent.
Merging excited-state copper catalysis and triplet nitro(hetero)arenes for direct synthesis of 2-aminophenol derivatives
作者:Jagrut A. Shah、Arghya Banerjee、Upasana Mukherjee、Ming-Yu Ngai
DOI:10.1016/j.chempr.2023.11.005
日期:2024.2
Nitro(hetero)arene derivatives are essential commodity chemicals used in various products, such as drugs, polymers, and agrochemicals. In this study, we leverage the excited-state reactivities of copper catalysts and nitro(hetero)arenes and the umpolung reactivity of acyl radicals to convert readily available nitro(hetero)arenes directly to valuable 2-aminophenol derivatives, which are important scaffolds
硝基(杂)芳烃衍生物是用于各种产品(例如药物、聚合物和农用化学品)的重要商品化学品。在这项研究中,我们利用铜催化剂和硝基(杂)芳烃的激发态反应性以及酰基自由基的反极性反应性,将容易获得的硝基(杂)芳烃直接转化为有价值的2-氨基苯酚衍生物,这是许多领域的重要支架。最畅销的药品。该反应适用于多种硝基(杂)芳烃、酰氯以及复杂分子的后期修饰,使其成为发现新功能分子的有用工具。机理研究,包括自由基捕获实验、Stern Volmer 猝灭研究、光开/关实验和 O 标记研究,表明反应机制涉及铜配合物的光激发、双自由基耦合和笼内接触离子对迁移。我们的研究结果提供了一种简化的方案,用于从硝基(杂)芳烃合成基本药效团,同时推进激发态和自由基化学的知识并刺激新的反应设计和开发。