DDQ-Promoted C-S Bond Formation: Synthesis of 2-Aminobenzothiazole Derivatives under Transition-Metal-, Ligand-, and Base-Free Conditions
摘要:
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.
Iron-Catalyzed Tandem Reactions of 2-Halobenzenamines with Isothiocyanates Leading to 2-Aminobenzothiazoles
作者:Jing-Wen Qiu、Xing-Guo Zhang、Ri-Yuan Tang、Ping Zhong、Jin-Heng Li
DOI:10.1002/adsc.200900450
日期:2009.10
A highly practical method for the synthesis of 2-aminobenzothiazoles has been developed through an iron-catalyzed tandemreaction. The present tandem process allows the assembly of a wide range of 2-aminobenzothiazoles by the reactions of 2-halobenzenamines with isothiocyanates.
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 2-Aminobenzothiazoles via Copper(I)-Catalyzed Cross-Coupling with Part-Per-Million Catalyst Loadings
作者:Ya-Lei Sun、Yuan Zhang、Xiao-Hui Cui、Wei Wang
DOI:10.1002/adsc.201100054
日期:2011.5.9
An efficient protocol has been developed for the preparation of 2‐aminobenzothiazoles via a copper(I)‐catalyzed tandem reaction of 2‐iodoanilines with isothiocyanates at very low catalyst loadings [typically 50 ppm of copper(I) iodide (CuI)]. A variety of 2‐iodoanilines could be cross‐coupled with isothiocyanates, affording 2‐aminobenzothiazoles in moderate to good yields (49–93%) under the given conditions