Copper-catalyzed tandem reactions of 2-halobenzenamines with isothiocyanates under ligand- and base-free conditions
作者:Yan-Jin Guo、Ri-Yuan Tang、Ping Zhong、Jin-Heng Li
DOI:10.1016/j.tetlet.2009.11.086
日期:2010.1
ligand-free copper-catalyzedreaction of 2-halobenzenamines with isothiocyanates has been developed for the synthesis of 2-aminobenzothiazoles. In the presence of CuBr and TBAB (tetra-n-butyl ammonium bromide, additive), a variety of 2-halobenzenamines underwent the reaction with isothiocyanates at 40 °C, affording 2-aminobenzothiazoles in moderate to excellent yields. It is noteworthy that the reaction is
Postsynthetic modification of IRMOF-3 with a copper iminopyridine complex as heterogeneous catalyst for the synthesis of 2-aminobenzothiazoles
作者:Jie Liu、Xiaobin Zhang、Jin Yang、Lei Wang
DOI:10.1002/aoc.3109
日期:2014.3
A copperiminopyridinecomplex has been immobilized on to a metal–organic framework (MOF) through postsyntheticmodification of IRMOF‐3. The modified MOFs were fully demonstrated by using a variety of methods, and the structural integrity of the modified MOFs has been confirmed by powder X‐ray diffraction (XRD). Furthermore, it was shown that the modified IRMOF‐3 can act as an efficient solid catalyst
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
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。
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