A simple and straightforward approach was developed to construct 5H‐benzo[b]carbazole derivatives by iron catalysis in a cascade sequence. The notable features of this work include an atom‐economical cascade sequence, unprecedented 1,4‐sulfonylmigration, tolerance of a variety of functional groups, good yields, and an economical catalytic system.
开发了一种简单而直接的方法,通过铁催化以级联顺序构建5 H-苯并[ b ]咔唑衍生物。这项工作的显着特征包括原子经济级联序列,前所未有的1,4-磺酰基迁移,对各种官能团的耐受性,良好的收率和经济的催化体系。
A concise approach for the synthesis of 3-iodoindoles and 3-iodobenzo[b]furans via Ph3P-catalyzed iodocyclization
作者:Yin-Long Li、Jian Li、Sheng-Nan Yu、Ji-Bo Wang、Yan-Min Yu、Jun Deng
DOI:10.1016/j.tet.2015.09.005
日期:2015.10
A variety of 3-iodoindole and 3-iodobenzo[b]furan derivatives were conveniently prepared from the corresponding 2-alkynylanilines and 2-alkynylphenols through Ph3P-catalyzed iodocyclization in the presence of N-iodosuccinimide (NIS). This protocol provides a rapid access to 3-iodoindoles and 3-iodobenzo[b]furans in good to excellent yields under mild conditions.
Rhodium(III)-Catalyzed Oxidative Allylic C–H Indolylation via Nucleophilic Cyclization
作者:Jiaqiong Sun、Kuan Wang、Peiyuan Wang、Guangfan Zheng、Xingwei Li
DOI:10.1021/acs.orglett.9b01553
日期:2019.6.21
Reported herein is a mild synthesis of 3-allylindoles via Rh(III)-catalyzed allylic C–H activation of olefins and coupling with o-alkynylanilines. The reaction proceeded via initial nucleophilic cyclization of o-alkynylanilines followed by oxidative coupling with allylic C–H bonds via an η3-allyl intermediate.
Rhodium(III)-Catalyzed Cascade Cyclization/Electrophilic Amidation for the Synthesis of 3-Amidoindoles and 3-Amidofurans
作者:Zhiyong Hu、Xiaofeng Tong、Guixia Liu
DOI:10.1021/acs.orglett.6b00689
日期:2016.5.6
A rhodium(III)-catalyzed cascade cyclization/electrophilic amidation using N-pivaloyloxylamides as the electrophilic nitrogen source has been developed. This protocol provides an efficient route for the synthesis of 3-amidoindoles and 3-amidofurans under mild conditions with good functional group tolerance. The synthetic utility of this reaction has been demonstrated through the derivatization of the
Abstract The cyclization reaction of 2-ethynyl- N -sulfonylanilides proceeded efficiently in water with the presence of a catalytic amount of K 2 CO 3 under transition metal-free condition to give indoles in high yields. The recovery and reusability of the present catalytic system were investigated.
摘要在无过渡金属条件下,在催化量的K 2 CO 3存在下,2-乙炔基-N-磺酰腈在水中的环化反应有效地进行,从而获得了高产率的吲哚。研究了本催化体系的回收率和可重复使用性。