Ruthenium-catalyzed meta/ortho-selective C–H alkylation of azoarenes using alkyl bromides
作者:Gang Li、Xingxing Ma、Chunqi Jia、Qingqing Han、Ya Wang、Junjie Wang、Liuyang Yu、Suling Yang
DOI:10.1039/c6cc09323j
日期:——
meta/ortho-Selective CAr-H (di)alkylation reactions of azoarenes with various types of alkyl bromides have been achieved via [Ru(p-cymene)Cl2]2 catalyzed ortho-metalation. Especially, dual meta-alkylations of azoarene and reductions offered an attractive strategy...
1,2,3-Benzodiazaboroles can be conveniently prepared from azobenzenes by a two-step protocol involving electrophilic ortho-borylation with BBr3 and dialkylative cyclization with the Grignard reagent. The methodology provides a diverse range of products equipped with functionalities from azobenzenes containing substituents (Me, t-Bu, F, Cl, Br, I, and OCF3) and a series of Grignard reagents (alkyl-
Visible-Light-Mediated Hydroacylation of Azobenzenes with α-Keto Acids
作者:Jingya Yang、Menghui Song、Hongyan Zhou、Ganggang Wang、Ben Ma、Yuanyuan Qi、Congde Huo
DOI:10.1021/acs.orglett.0c03039
日期:2020.11.6
A visible-light-mediated protocol for the hydroacylation of azobenzenes with α-keto acids has been developed. In the absence of any catalyst or additive, decarboxylative hydroacylation proceeded smoothly under visible-light irradiation at room temperature. A wide range of azobenzenes and α-keto acids were well-tolerated and afforded hydroacylation products in high to excellent yields. Preliminary investigations
Cu(I) mediated one-pot synthesis of azobenzenes from bis-Boc aryl hydrazines and aryl halides
作者:Kyu-Young Kim、Jeong-Taek Shin、Kang-Sang Lee、Cheon-Gyu Cho
DOI:10.1016/j.tetlet.2003.10.091
日期:2004.1
N,N′-bis-Boc aryl hydrazines underwent Cu(I) catalyzed couplings with aryl halides to provide N,N′-bis-Boc diarylhydrazines. The resulting N,N′-bis-Boc diarylhydrazines are readily oxidized to the azobenzenes in the presence of Cu(I) and a base. A prolonged heating of the initial coupling reactions directly provides the corresponding azobenzenes in one pot.