Controllable Rh(III)-Catalyzed Annulation between Salicylaldehydes and Diazo Compounds: Divergent Synthesis of Chromones and Benzofurans
作者:Peng Sun、Shang Gao、Chi Yang、Songjin Guo、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.6b03355
日期:2016.12.16
A Rh(III)-catalyzed annulation between salicylaldehydes and diazocompounds with controllable chemoselectivity is described. AgNTf2 favored benzofurans via a tandem C–H activation/decarbonylation/annulation process, while AcOH led to chromones through a C–H activation/annulation pathway. The reaction exhibited good functional group tolerance and scalability. Moreover, only a single regioisomer of benzofuran
[3 + 3]-Cycloaddition of α-Diazocarbonyl Compounds and <i>N</i>-Tosylaziridines: Synthesis of Polysubstituted 2<i>H</i>-1,4-Oxazines through Synergetic Catalysis of AgOTf/Cu(OAc)<sub>2</sub>
作者:Shangwen Fang、Yanwei Zhao、Haiyan Li、Yonggao Zheng、Pengcheng Lian、Xiaobing Wan
DOI:10.1021/acs.orglett.9b00632
日期:2019.4.5
An impressive and new [3 + 3]-cycloaddition of α-diazocarbonyl compounds with N-tosylaziridines via synergetic catalysis of AgOTf and Cu(OAc)2 has been well described, which offers efficient access to highly substituted 2H-1,4-oxazine derivatives. A variety of α-diazocarbonyl compounds and N-tosylaziridines were compatible substrates with convenient operations under mild reaction conditions.
已经很好地描述了通过AgOTf和Cu(OAc)2的协同催化,α-重氮羰基化合物与N-甲苯磺酰氮丙啶类化合物令人印象深刻且新颖的[3 + 3]-环加成反应,该反应可有效地获得高度取代的2 H -1,4-恶嗪衍生物。多种α-重氮羰基化合物和N-甲苯磺酰基氮丙啶是相容的底物,在温和的反应条件下操作方便。
Cu(I)-catalyzed reaction of diazo compounds with terminal alkynes: a direct synthesis of trisubstituted furans
作者:Mohammad Lokman Hossain、Fei Ye、Yan Zhang、Jianbo Wang
DOI:10.1016/j.tet.2014.07.086
日期:2014.9
method for the synthesis of tri-substituted furans has been developed based on Cu(I)-catalyzed reaction of terminalalkynes with β-keto α-diazoesters. This method for the synthesis of 2,3,5-trisubstituted furans is operationally simple and applicable to wide substrate scope. Moreover, this synthesis employs cheap Cu(MeCN)4PF6 as the catalyst and no additional ligand is needed. Similar reaction has also been
Synthesis of Polysubstituted Phenols by Rhodium‐Catalyzed C−H/Diazo Coupling and Tandem Annulation
作者:Min Liu、Kelu Yan、Jiangwei Wen、Xue Li、Xiaoyu Wang、Fengjie Lu、Xiu Wang、Hua Wang
DOI:10.1002/adsc.202001456
日期:2021.3.29
rhodium(III)‐catalyzed C−H/diazo coupling and tandem annulation of 3‐oxopent‐4‐enenitriles have been proposed for the synthesis of polysubstituted phenols. Most products of phenols are obtained in good yields. Several preliminary mechanistic studies and derivatization reactions of phenol products were also performed. This method offers an alternative approach for the synthesis of useful diverse phenols.
Regioselective synthesis of multisubstituted isoquinolones and pyridones via Rh(<scp>iii</scp>)-catalyzed annulation reactions
作者:Liangliang Shi、Ke Yu、Baiquan Wang
DOI:10.1039/c5cc05977a
日期:——
A mild and efficient Rh(III)-catalyzedregioselective synthesis of isoquinolones and pyridones has been developed. The protocol uses readily available N-methoxybenzamide or N-methoxymethacrylamide and diazo compounds as the starting materials. The...