Formation of Enehydrazine Intermediates through Coupling of Phenylhydrazines with Vinyl Halides: Entry into the Fischer Indole Synthesis
作者:Fuxu Zhan、Guangxin Liang
DOI:10.1002/anie.201207173
日期:2013.1.21
Cut to the chase: Direct formation of an enehydrazine, an intermediate in the classic Fischerindolesynthesis, solves the regioselectivity problem associated with indolization. This approach not only achieves selective synthesis of indoles through proper selection of the vinyl halide, but also leads to quick construction of desoxyeseroline and esermethole, as well as the key structural motif in the
Iodine-Catalyzed C–H Amidation and Imination at the 2α-Position of 2,3-Disubstituted Indoles with Chloramine Salts
作者:Xiaozu Liu、Yuxiang Zhou、Zhongqin Yang、Qin Li、Liang Zhao、Peijun Liu
DOI:10.1021/acs.joc.8b00286
日期:2018.4.20
A novel iodine-catalyzed amidation and imination at the 2α-position of 2,3-disubstituted indoles in the presence of chloramine salts with high regioselectivity has been achieved. The protocol is applicable to a wide range of substrates to deliver the corresponding 2α-nitrogen-containing indole derivatives. Furthermore, to demonstrate the synthetic value of this established transformation, a concise
The reactions of 1,2,3-trimethylindole and of N-alkyltetrahydrocarbazoles with trifluoroacetic anhydride
作者:A. Sydney Bailey、Joanna B. Haxby、Andrew N. Hilton、Josephine M. Peach、Marazban H. Vandrevala
DOI:10.1039/p19810000382
日期:——
Treatment of 1,2,3-trimethylindole with trifluoroaceticanhydride results in attack on the C-2 methyl group of the indole, and trifluoroacetylation of N-alkyltetrahydrocarbazoles occurs at C-1.
safe and convenient open-flask copper-catalyzed selective oxidation/functionalization methodology for tetrahydrocarbolines and tetrahydro-β-carbolines that employs atmospheric O2 as the terminal oxidant. The system is applicable to oxidative rearrangement of tetrahydro-β-carbolines, tetrahydrocarboline oxidation to α-alkoxy carbazoles and spirooxindoles, and Witkop oxidation. Mechanistic experiments indicated
我们报告了一种使用大气 O 2作为终端氧化剂的四氢咔啉和四氢-β-咔啉的安全且方便的开瓶铜催化选择性氧化/功能化方法。该体系适用于四氢-β-咔啉的氧化重排,四氢咔啉氧化成α-烷氧基咔唑和螺氧吲哚,以及Witkop氧化。机械实验表明,单电子氧化过程负责可调选择性控制。这种铜催化协议代表了吲哚氧化领域的重大进步。