A simple and efficient one-potsynthesis of substituted indolo[1,2-a]quinolines under transition-metal-free conditions has been developed. When 2-fluorobenzaldehyde was treated with substituted 2-methylindoles in the presence of Cs2CO3, the desired products were typically obtained in good to excellent yields. This reaction sequence involves a nucleophilic aromatic substitution and a Knoevenagel condensation
已经开发了一种在无过渡金属条件下简单高效的一锅合成取代吲哚[1,2- a ]喹啉的方法。当在Cs 2 CO 3存在下用取代的2-甲基吲哚处理2-氟苯甲醛时,通常以良好或优异的产率获得所需产物。该反应序列涉及亲核芳族取代和Knoevenagel缩合反应。我们的机理研究表明,第一步中两个反应都可能以分子间反应的形式进行。
GaCl<sub>3</sub>-Catalyzed C–H Cyanation of Indoles with <i>N</i>-Cyanosuccinimide
作者:Xue Wang、Mohamed Makha、Shu-Wei Chen、Huaiji Zheng、Yuehui Li
DOI:10.1021/acs.joc.9b00416
日期:2019.5.17
An efficient GaCl3-catalyzed direct cyanation of indoles and pyrroles using bench-stable electrophilic cyanating agent N-cyanosuccinimide was achieved and afforded 3-cyanoindoles and 2-cyanopyrroles in good yields and excellent regioselectivities. Notably, this protocol exhibited high reactivity for unprotected indoles and was applicable to a broad range of indole and pyrrole substrates.
An Efficient Approach to Azolyl-Substituted Steroids through Copper-Catalyzed Ullmann C-N Coupling
作者:Yury N. Kotovshchikov、Gennadij V. Latyshev、Nikolay V. Lukashev、Irina P. Beletskaya
DOI:10.1002/ejoc.201300719
日期:2013.12
Ullmann-type C–Ncoupling of vinyliodides and nitrogen heterocycles has been shown to be a straightforward and highly efficientapproach to azolyl-substitutedsteroids. The amination reaction proved sensitive to steric effects exerted by the substituents in both iodide and heterocycle. The influence of reaction conditions (catalyst, base, solvent, and temperature) on conversion of the iodosteroid and
乙烯基碘化物和氮杂环的 Ullmann 型 C-N 偶联已被证明是一种直接且高效的唑基取代类固醇方法。胺化反应被证明对碘化物和杂环中的取代基所产生的空间效应很敏感。研究了反应条件(催化剂、碱、溶剂和温度)对碘甾类转化率和选择性的影响。在 100 °C 的二甲基亚砜中包含 10 mol-% CuI 和 20 mol-% 二戊酰甲烷和 K2CO3 的催化体系提供了最好的结果。详细的协议允许与各种取代的吲哚、咪唑、咔唑、吲唑和仲酰胺偶联的碘类固醇,以良好到极好的收率提供相应的唑基取代类固醇。
Simple Conversion of Enamines to 2<i>H</i>-Azirines and Their Rearrangements under Thermal Conditions
A variety of substituted enamine derivatives were first found to be conveniently converted to the corresponding 2H-azirines mediated by phenyliodine (III) diacetate (PIDA). The formed 2-aryl-2H-azirines could be applied in the synthesis of indole-3-carbonitriles or isoxazoles via thermal rearrangements.
An efficient trans‐PdCl2(NH2CH2COOH)2‐catalyzed direct C3‐cyanation of indole C─H bonds is described. Notably, free (N─H)‐indoles reacted smoothly using the procedure, and the desired product 3‐cyanoindoles were obtained in good to excellent yields.