Iron-catalyzed oxidative etherification of benzylic C(sp3)–H bonds with phenols
作者:Bei Li、Yang Liu、Yan-Ling Song、Hong-Mei Sun
DOI:10.1016/j.tetlet.2023.154690
日期:2023.9
present work provides a general protocol with high levels of step- and atom-economy for the synthesis of aryl ethers, particularly for aryl benzylethers. The direct use of toluene and phenols as starting materials also renders this protocol as a novel strategy for the protection of hydroxylgroups presented in various phenols.
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。
Ashley et al., Journal of the Chemical Society, 1958, p. 3298,3308
作者:Ashley et al.
DOI:——
日期:——
Palladium charcoal-catalyzed deprotection of O-allylphenols
Allyl aryl ethers can be easily cleaved by the use of 10% Pd/C under mild and basic conditions. The present reaction would involve a SET process rather than a pi-allyl-palladium complex. The scope and limitation of this new deprotective methodology is also described. (C) 2004 Elsevier Ltd. All rights reserved.
Ashley et al., Journal of the Chemical Society, 1959, p. 897,901