Direct Amination of Azoles via Catalytic C−H, N−H Coupling
摘要:
C-H, N-H Coupling of azoles takes place with several amines in the presence of a copper catalyst to undergo amination at the 2-position. The reaction of benzothiazole with N-methylaniline in the presence of sodium acetate and 20 mol % Cu(OAc)(2) in xylene under an oxygen atmosphere afforded the aminated product in 81% yield.
Copper-catalyzed oxidative C‒H, N‒H coupling of azoles and thiophenes
作者:Shinobu Mitsuda、Taiki Fujiwara、Katsuyoshi Kimigafukuro、Daiki Monguchi、Atsunori Mori
DOI:10.1016/j.tet.2012.03.001
日期:2012.5
C-H, N-H coupling of azole and thiophene derivatives takes place in the presence of a catalytic amount of Cu(OAc)(2) and an additive. The reaction of azoles smoothly occurs with several amines and amides catalyzed by 20 mol % of Cu(OAc)(2)-2PPh(3) and 4 equiv of NaOAc under O-2 or in the presence of Ag2CO3 under N-2. The coupling reaction leads to a facile synthesis of a N-substituted analogue of 2,5-diarylthiazole, which shows photoluminescent properties with extended pi-conjugation. Spectroscopic characteristics of the obtained thiazole derivatives are discussed by measurements of UV-vis absorption and photoluminescent spectra. Under the reaction conditions using Ag2CO3 as an additive and Cu(OAc)2-2PPh3 as a catalyst, thiophene derivatives also react with 2-pyrrolidone to undergo C-H, N-H amidation. (C) 2012 Elsevier Ltd. All rights reserved.
Cu(acac)2 catalyzed oxidative C–H bond amination of azoles with amines under base-free conditions
作者:Yogesh S. Wagh、Bhalchandra M. Bhanage
DOI:10.1016/j.tetlet.2012.09.064
日期:2012.11
This work reports a simple and efficient methodology for oxidative C-H bond amination of azoles with aromatic/aliphatic amines using copper-bis-acetylacetonate complex catalyst. The catalyst works very well in the absence of external acid or base and requires only molecular oxygen as an oxidant. The methodology is applicable for the oxidative C-H bond amination of various azoles with different types of aromatic/aliphatic amines for the synthesis of various aminoheterocycles with good to excellent yields. (C) 2012 Elsevier Ltd. All rights reserved.
Direct Amination of Azoles via Catalytic C−H, N−H Coupling
作者:Daiki Monguchi、Taiki Fujiwara、Hirotoshi Furukawa、Atsunori Mori
DOI:10.1021/ol900298e
日期:2009.4.2
C-H, N-H Coupling of azoles takes place with several amines in the presence of a copper catalyst to undergo amination at the 2-position. The reaction of benzothiazole with N-methylaniline in the presence of sodium acetate and 20 mol % Cu(OAc)(2) in xylene under an oxygen atmosphere afforded the aminated product in 81% yield.