straightforward and efficient synthesis of naphtho[1,8‐bc]pyran derivatives and related polycyclic compounds is achieved by the rhodium‐catalyzed oxidative coupling of 1‐naphthols or other phenolic and alcoholic substrates with alkynes. In these annulation reactions, the hydroxy groups effectively act as the key function for the regioselective CHbondcleavage.
萘并[1,8- bc ]吡喃衍生物和相关多环化合物的直接有效合成是通过1-萘酚或其他酚和醇底物与炔烃的铑催化氧化偶联而实现的。在这些环化反应中,羟基有效地充当区域选择性CH键裂解的关键功能。
Hydroxyl-Directed Ruthenium-Catalyzed C–H Bond Functionalization: Versatile Access to Fluorescent Pyrans
作者:Vedhagiri S. Thirunavukkarasu、Margherita Donati、Lutz Ackermann
DOI:10.1021/ol301387t
日期:2012.7.6
Hydroxyl-assisted oxidative annulations of alkynes were accomplished with an inexpensive ruthenium(II) complex, delivering fluorescent pyrans via highly site selective as well as chemo- and regioselective C-H/O-H bond functionalizations.
Cobalt-Catalyzed, Hydroxyl-Assisted C–H Bond Functionalization: Access to Diversely Substituted Polycyclic Pyrans
作者:Pratip K. Dutta、Mahesh Kumar Ravva、Subhabrata Sen
DOI:10.1021/acs.joc.8b02446
日期:2019.2.1
Highly efficient oxidative annulation of alkynes furnished diversely substituted pyran[2,3,4-de] chromene-2-one derivatives and related polycycles in moderate to high yield. The reaction is catalyzed by nontoxic, air-stable, and inexpensive Cp*Co(CO)I-2 catalyst. The hydroxyl moiety at the substrate acts as the directing group for the C-H bond activation.
Hydroxyl‐Directed Iridium‐Catalyzed Synthesis of Pyrano[2,3,4‐
<i>de</i>
]chromen‐2‐ones and Further Chalcogenation under Blue‐Light Irradiation
作者:Kelu Yan、Xiaoyu Wang、Jiangwei Wen、Qiuyun Li、Ning Zhang、Shuyun Zhu、Xian‐En Zhao、Xiu Wang
DOI:10.1002/ejoc.202201171
日期:2022.11.18
protocol possesses several notable features in terms of employing poorly developed iridium and environmentally friendly visible light as catalysts, the absence of external ligands and photosensitizers, atomic economy and site selectivity, and overcoming the chelation of the carbonyl in coumarin skeleton to the iridiumcatalyst.
已经开发了羟基导向的铱催化合成吡喃并 [ 2,3,4- de ]chromen-2-ones 并在蓝光照射下进一步硫属化。该方案在使用不发达的铱和环境友好的可见光作为催化剂、不存在外部配体和光敏剂、原子经济性和位点选择性以及克服香豆素骨架中羰基对铱催化剂的螯合等方面具有几个显着特征。