The facile synthesis of 2-bromoindoles via Cs2CO3-promoted intramolecular cyclization of 2-(gem-dibromovinyl)anilines under transition-metal-free conditions
Microwave irradiated synthesis of 2-bromo(chloro)indoles via intramolecular cyclization of 2-(gem-dibromo(chloro)vinyl)anilines in the presence of TBAF under metal-free conditions
作者:Min Wang、Pinhua Li、Wei Chen、Lei Wang
DOI:10.1039/c4ra00603h
日期:——
2-Bromo(chloro)indoles were readily prepared through TBAF-promoted intramolecular cyclization of 2-(gem-dibromo(chloro)vinyl)anilines in excellent yields under metal-free and microwave irradiation conditions.
The synthesis of chromeno[2,3‐b]indolefrom simple starting materials remains a demanding process. Herein, 2‐bromoindole undergoes nucleophilic attack from salicylaldehyde, followed by intramolecular insertion of an aldehyde group and aromatization to generate the desired chromeno[2,3‐b]indoles. Moreover, various functional groups were tolerated and a gram‐scale synthesis of the product could be achieved
由简单的起始原料合成苯并[2,3-b]吲哚仍然是一个艰巨的过程。在此,2-溴吲哚经历了水杨醛的亲核攻击,随后在分子内插入醛基并进行芳构化以生成所需的chromeno [2,3- b ]吲哚。此外,可以容忍各种官能团,并且在最佳条件下可以实现克级的产物合成。
Provided are compounds having metalloenzyme modulating activity, and methods of treating diseases, disorders or symptoms thereof mediated by such metalloenzymes.
The Role of Reversible Oxidative Addition in Selective Palladium(0)-Catalyzed Intramolecular Cross-Couplings of Polyhalogenated Substrates: Synthesis of Brominated Indoles
作者:Stephen G. Newman、Mark Lautens
DOI:10.1021/ja1052335
日期:2010.8.25
A Pd(0)-catalyzed C-N bond-forming reaction leading to the synthesis of brominated indoles is described. The use of the phosphine ligand PtBu3 is necessary for reactivity. It is proposed that the bulky ligand serves to prevent inhibition of the catalyst by facilitating reversible oxidative addition into the product C-Br bond. Intramolecular coupling of a vinyl bromide in the presence of an aryl iodide can take place, demonstrating unprecedented levels of selectivity.