Nickel-Catalyzed Reductive Cross-Coupling of <i>N</i>-Acyl and <i>N</i>-Sulfonyl Benzotriazoles with Diverse Nitro Compounds: Rapid Access to Amides and Sulfonamides
作者:Erdong Qu、Shangzhang Li、Jin Bai、Yan Zheng、Wanfang Li
DOI:10.1021/acs.orglett.1c03535
日期:2022.1.14
Herein we report a Ni-catalyzed reductive transamidation of conveniently available N-acyl benzotriazoles with alkyl, alkenyl, and aryl nitro compounds, which afforded various amides with good yields and a broad substrate scope. The same catalytic reaction conditions were also applicable for N-sulfonyl benzotriazoles, which could undergo smooth reductive coupling with nitroarenes and nitroalkanes to
在此,我们报道了一种方便获得的N-酰基苯并三唑与烷基、烯基和芳基硝基化合物的 Ni 催化还原转酰胺基反应,该反应以良好的收率和广泛的底物范围提供了各种酰胺。相同的催化反应条件也适用于N-磺酰基苯并三唑,它可以与硝基芳烃和硝基烷烃进行平滑的还原偶联,得到相应的磺酰胺。
Silver–copper co-catalyzed cascade intramolecular cyclization/desulfinamide/dehydrogenation: one-pot synthesis of substituted carbazoles
作者:Yuanqiong Huang、Zhonglin Guo、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/c8cc03600d
日期:——
Herein, a silver and copper co-catalyzed cascade intramolecular cyclization/desulfinamide/dehydrogenation reaction for the synthesis of substituted carbazoles is reported. This reaction, which involved formation of new C–C and C–N bonds as well as C–N bond cleavage, afforded diverse carbazoles in high yields and showed good functional group tolerance.
Intramolecular Oxidative C−N Bond Formation for the Synthesis of Carbazoles: Comparison of Reactivity between the Copper-Catalyzed and Metal-Free Conditions
作者:Seung Hwan Cho、Jungho Yoon、Sukbok Chang
DOI:10.1021/ja111652v
日期:2011.4.20
New synthetic procedures for intramolecular oxidative C-N bondformation have been developed for the preparation of carbazoles starting from N-substituted amidobiphenyls under either Cu-catalyzed or metal-freeconditions using hypervalent iodine(III) as an oxidant. Whereas iodobenzene diacetate or bis(trifluoroacetoxy)iodobenzene alone undergoes the reaction to provide carbazole products in moderate
已经开发了用于分子内氧化 CN 键形成的新合成程序,用于在 Cu 催化或无金属条件下使用高价碘 (III) 作为氧化剂从 N 取代的酰氨基联苯制备咔唑。虽然二乙酸碘苯或双(三氟乙酰氧基)碘苯单独进行反应以提供中低收率的咔唑产物,但三氟甲磺酸铜(II)和碘(III)物质的组合使用显着提高了反应效率,提供了更多样化的范围产品良率高。在包括动力学曲线、同位素效应和自由基抑制实验在内的机理研究的基础上,铜物种被提议用于催化激活高价碘 (III) 氧化剂。
Transition-metal-free and organic solvent-free conversion of <i>N</i>-substituted 2-aminobiaryls into corresponding carbazoles <i>via</i> intramolecular oxidative radical cyclization induced by peroxodisulfate
作者:Palani Natarajan、Priya Priya、Deachen Chuskit
DOI:10.1039/c7gc03130k
日期:——
benign approach for the synthesis of N-substituted carbazoles from analogous 2-aminobiaryls using peroxodisulfate in water is reported. The reactions proceeded through an intramolecular oxidative radical cyclization of N-substituted 2-aminobiaryls with in situ reoxidation of the resulting radical species. When compared to known methods for the synthesis of N-substituted carbazoles from 2-amidobiaryls, this
Palladium-Catalyzed Method for the Synthesis of Carbazoles via Tandem C−H Functionalization and C−N Bond Formation
作者:W. C. Peter Tsang、Rachel H. Munday、Gordon Brasche、Nan Zheng、Stephen L. Buchwald
DOI:10.1021/jo801273q
日期:2008.10.3
The development of a new method for the assembly of unsymmetrical carbazoles is reported. The strategy involves the selective intramolecular functionalization of an arene C-Hbond and the formation of a new arene C-Nbond. The substitution pattern of the carbazole product can be controlled by the design of the biaryl amide substrate, and the method is compatible with a variety of functional groups