Substituted phenylazo and phenylazoxy compounds were systematically prepared and their anti-androgenic activity was measured in terms of (1) the growth-inhibiting effect on an androgen-dependent cell line, SC-3, and (2) the binding affinity of nuclear androgen receptor. Generally, azo/azoxy compounds showed cell toxicity, and the growth-inhibiting effects on SC-3 cells correlated with the toxicity. However, some compounds, including 4, 4'-dinitroazobenzene (25), 4, 4'-dimethoxyazobenzene (33), and 2, 2'-dichloroazoxybenzene (47), possessed potent anti-androgenic activity without apparent cell toxicity.
Rhodium(III)-Catalyzed Synthesis of Cinnolinium Salts from Azobenzenes and Diazo Compounds
作者:Xiaohong Chen、Guangfan Zheng、Guoyong Song、Xingwei Li
DOI:10.1002/adsc.201800326
日期:2018.8.6
A Rh(III)‐catalyzed C−H activation of azobenzenes in the coupling with diazo compounds has been realized, providing a straightforward strategy to access functionalized cinnolinium triflates in high yields. This protocol features silver free mild reaction conditions and compatibility with diverse functional groups. The coupling proceeds via initial Rh(III)‐catalyzed C−H alkylation, followed by zinc
One-pot Synthesis of Oxindoles through C−H Alkylation and Intramolecular Cyclization of Azobenzenes with Internal Olefins
作者:Sang Hoon Han、Neeraj Kumar Mishra、Hyeim Jo、Yongguk Oh、Mijin Jeon、Saegun Kim、Woo Jung Kim、Jong Suk Lee、Hyung Sik Kim、In Su Kim
DOI:10.1002/adsc.201700147
日期:2017.7.17
as maleimides, maleates and fumarates, followed by reductiveintramolecularcyclization is described. A cationic rhodium catalyst in the presence of acetic acid additive in dichloroethane solvent was found to be the optimal catalytic system for the construction of ortho‐alkylated azobenzenes, which smoothly underwent the intramolecularcyclization leading to the formation of C3‐functionalized oxindoles
Rhodium(III)-Catalyzed Synthesis of Cinnolinium Salts from Azobenzenes and Alkynes: Application to the Synthesis of Indoles and Cinnolines
作者:Krishnamoorthy Muralirajan、Chien-Hong Cheng
DOI:10.1002/chem.201300922
日期:2013.5.10
Versatile salts: A new rhodium‐catalyzed synthesis of cinnolinium salts from various azobenzenes and alkynes under air is described. These salts readily transform into three important classes of products, including indoles, indoloindoles, and cinnolines (see scheme).
direct oxidation of hydrazine HN–NH bonds to azo group functionality catalyzed by molecular iodine is disclosed. The strengths of this reactivity include rapid reaction times, low catalyst loadings, use of ambient dioxygen as a stoichiometric oxidant, and ease of experimental set-up and azo product isolation. Mechanistic studies and density functional theory computations offering insight into this reactivity