General and efficient synthesis of 2,3-unsubstituted indoles catalyzed by acidic mesoporous molecular sieves
摘要:
A general and efficient method for the synthesis of 2,3-unsubstituted indoles has been established by the intramolecular cyclization of N-benzyl 2-anilinoacetals. Acidic mesoporous molecular sieve (MCM-41-SO3H) has shown excellent catalytic activity on this transformation, and the 2,3-unsubstituted indoles bearing 7-substituent or strong electron-withdrawing substituents also could be achieved by this protocol. Moreover, the heterogeneous catalyst, MCM-41-SO3H, could be conveniently recovered and reused without obvious loss of the catalytic activity. This work will provide an economic and environmental-benign method for the construction of various indole derivatives. (C) 2013 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Regioselective Oxidative Coupling of Indoles and One-Pot Synthesis of Acetoxylated Biindolyls
作者:Zunjun Liang、Jinlong Zhao、Yuhong Zhang
DOI:10.1021/jo902265s
日期:2010.1.1
developed to achieve Pd-catalyzed homocoupling of indoles with excellent regioselectivity in the presence of Cu(OAc)2·H2O in DMSO at room temperature in high efficiency. This method provides a simple route to 2,3′-biindolyls from the electron-rich to moderately electron-poor indoles. The reaction tolerates the bromide substituent on indoles. In addition, a one-pot approach to C3-position acetoxylated biindolyls
Chiral Macrocycle‐Enabled Counteranion Trapping for Boosting Highly Efficient and Enantioselective Catalysis
作者:Rui Ning、Hao Zhou、Shi‐Xin Nie、Yu‐Fei Ao、De‐Xian Wang、Qi‐Qiang Wang
DOI:10.1002/anie.202003673
日期:2020.6.26
manipulated for tuning the catalysis process. In parallel to well‐developed crown ether‐based cation‐binding catalysis, a macrocycle‐enabled counteranion trapping strategy is presented for boosting highly efficient and enantioselective catalysis. A set of bis‐diarylthiourea macrocycles containing two BINOL moieties were designed and synthesized. They possess a well‐confined chiral cavity and strong binding
Insights into the structural patterns of the antileishmanial activity of bi- and tricyclic N-heterocycles
作者:Lizzi Herrera、David E. Stephens、Abigail D'Avila、Kathryn G. George、Hadi Arman、Yu Zhang、George Perry、Ricardo Lleonart、Oleg V. Larionov、Patricia L. Fernández
DOI:10.1039/c6ob01149g
日期:——
various structural patterns in a series of novel bi- and tricyclic N-heterocycles on the activity against Leishmania major and Leishmania panamensis has been studied and compounds that are active in the low micromolar region have been identified. Both quinolines and tetrahydrooxazinoindoles (TOI) proved to have significant antileishmanial activities, while substituted indoles were inactive. We have also
Direct electrophilic trifluoromethylthiolation of N-benzyl indoles using AgSCF3
作者:Lan Ma、Xiu-Fen Cheng、Yan Li、Xi-Sheng Wang
DOI:10.1016/j.tetlet.2016.05.086
日期:2016.7
A novel electrophilic trifluoromethylthiolation reactionsystem has been developed with AgSCF3 used directly as the SCF3 source, in the presence of KI/K2S2O8/I2. Various N-benzylindoles have been trifluoromethylthiolated successfully with this system, and the mechanism of investigation showed an electrophilicreagent was generated in situ.
在KI / K 2 S 2 O 8 / I 2的存在下,已经开发了一种新型的亲电子三氟甲基硫醇化反应系统,其中AgSCF 3直接用作SCF 3源。该系统已成功地将各种N-苄基吲哚三氟甲基硫醇化,研究机理表明原位产生了亲电试剂。
Efficient Catalytic Kinetic Resolution of Spiro-epoxyoxindoles with Concomitant Asymmetric Friedel-Crafts Alkylation of Indoles
作者:Gongming Zhu、Guangjun Bao、Yiping Li、Wangsheng Sun、Jing Li、Liang Hong、Rui Wang
DOI:10.1002/anie.201700494
日期:2017.5.2
process involving the catalytic kinetic resolution of racemic spiro‐epoxyoxindoles with the simultaneous enantioselective Friedel–Crafts alkylation of indoles has been realized using a chiral phosphoric acid catalyst. The reaction provides two useful intermediates in high yields and excellent enantioselectivities. Performing the catalysis on a gram scale led to (R)‐3‐(3‐indolyl)‐oxindole‐3‐methanol, which