A practical synthesis of 2-aminobenzothiazoles via copper(I)-catalyzed tandem reaction of 2-iodoanilines with isothiocyanates in ionic liquids
作者:Ling Chen、Bin Huang、Quan Nie、Mingzhong Cai
DOI:10.1002/aoc.3453
日期:2016.6
copper(I)‐catalyzedtandemreaction of 2‐iodoanilines with isothiocyanates was achieved in hydrophobic [bmim][PF6] ionicliquid under mild conditions, generating a variety of 2‐aminobenzothiazoles in good to excellent yields. The tandemreaction that was carried out in [bmim][PF6] has some obvious advantages such as accelerated reaction rate and increased yield as compared with the reaction run in volatile
An FeCl3-catalyzed tandemreaction of 2-iodoaniline with isothiocyanate in water is described, which provides an environmentally benign, efficient, and practical route for the generation of 2-aminobenzothiazole. This present tandem process shows broad substrate scope in the presence of octadecyltrimethylammonium chloride as a phase-transfer catalyst. In addition, the reaction media can be recovered
A practical synthesis of 2-aminobenzothiazoles via the tandem reactions of 2-haloanilines with isothiocyanates catalyzed by immobilization of copper in MCM-41
作者:Ruian Xiao、Wenyan Hao、Jinting Ai、Ming-Zhong Cai
DOI:10.1016/j.jorganchem.2012.01.014
日期:2012.5
The heterogeneous tandemreactions of 2-haloanilines with isothiocyanates were achieved in DMSO using Et3N as base at 80 °C in the presence of a 3-(2-aminoethylamino)propyl-functionalized MCM-41-immobilized copper(II) complex [MCM-41-2N-CuSO4], yielding a variety of 2-aminobenzothiazoles in good to excellent yields. This heterogeneous copper catalyst exhibited higher activity than CuSO4 and can be
Synthesis of N-substituted-2-aminobenzothiazoles using nano copper oxide as a recyclable catalyst under ligand-free conditions, in reusable PEG-400 medium
A simple and practical method for the synthesis of N-substituted-2-aminobenzothiazoles via a cross-coupling reaction of 2-iodo anilines with isothiocyanates is envisaged usingnano copper oxide as a recyclablecatalyst and Cs2CO3 as a base in PEG-400, as a bio-degradable, reusable, inexpensive and non-toxic reaction medium, under ligand-free conditions. The present tandem process underlines environmental
一种用于合成简单实用的方法Ñ取代-2-氨基苯并经由与异硫氰酸酯2-碘苯胺交叉偶联反应是设想使用氧化物纳米铜作为可回收催化剂和Cs 2 CO 3作为PEG-碱400,在无配体条件下作为可生物降解,可重复使用,廉价且无毒的反应介质。本发明的串联方法强调了环境可接受性以良好至优异的产率获得各种N-取代的2-氨基苯并噻唑。
DDQ-Promoted C-S Bond Formation: Synthesis of 2-Aminobenzothiazole Derivatives under Transition-Metal-, Ligand-, and Base-Free Conditions
A transition-metal-free method for the intramolecular S-arylation of o-halobenzothiaoureas via DDQ-mediated leading to the 2-aminobenzothiazole derivatives is reported. The reactions are performed at room temperature under ligand-and base-free conditions with good to excellent yields.