Transition-Metal-Free<i>N</i>-Arylation of Pyrazoles with Diaryliodonium Salts
作者:Zsombor Gonda、Zoltán Novák
DOI:10.1002/chem.201502995
日期:2015.11.16
developed for the N‐arylation of pyrazoles using diaryliodoniumsalts. The transformation does not require any transition‐metal catalyst and provides the desired N‐arylpyrazoles rapidly under mild reaction condition in the presence of aqueous ammonia solution as a mild base without the use of inert atmosphere. The chemoselectivity of unsymmetric diaryliodoniumsalts was also explored with large number
Reaction of iodoarenes with potassium peroxodisulfate/trifluoroacetic acid in the presence of aromatics. Direct preparation of diaryliodonium triflates from iodoarenes
作者:Md. Delwar Hossain、Tsugio Kitamura
DOI:10.1016/j.tet.2006.04.073
日期:2006.7
triflates have been directly prepared by reaction of some iodoarenes with aromatic substrates in good yields by using K2S2O8/CF3COOH/CH2Cl2. Treatment of a variety of iodoarenes with iodobenzene under the same conditions resulted in ligand transfer, and (4-iodophenyl)(phenyl)iodonium triflate was obtained. This procedure avoids the use of high temperature and severe reaction conditions.
通过使用K 2 S 2 O 8 / CF 3 COOH / CH 2 Cl 2,一些碘代芳烃与芳族底物反应,可以直接制备三芳基二芳烃。在相同条件下用碘代苯处理各种碘代芳烃导致配体转移,得到三氟甲磺酸(4-碘代苯基)(苯基)碘鎓。该程序避免了使用高温和苛刻的反应条件。
Ligand- and Base-Free Access to Diverse Biaryls by the Reductive Coupling of Diaryliodonium Salts
作者:V. Arun、P. O. Venkataramana Reddy、Meenakshi Pilania、Dalip Kumar
DOI:10.1002/ejoc.201600242
日期:2016.4
Pd-catalyzed protocol to access a wide range of symmetrical and unsymmetrical biaryls from stable diaryliodonium salts was developed. The reaction involved the use of an effective and recyclable Pd/polyethylene glycol-400 catalyst system to harness the aryl moieties of two diaryliodonium salts; the ensuing biaryls may be utilized to synthesize an array of useful compounds, including 5-aryluracils, carbazoles
Introduction of 4-Chlorophenyl: A Protecting Group for the
Hydroxy Function
作者:Koichi Fukase、Yuji Otsuka、Toshihiro Yamamoto
DOI:10.1055/s-0036-1591984
日期:2018.7
and diaryliodonium triflate. This protecting group is stable under the Lewis acidic conditions of glycosylation, but it can be readily removed by the initial conversion into the corresponding 4-methoxyphenyl ether with use of a Pd catalyst, followed by oxidation with ammoniumcerium (IV) nitrate [(NH 4 ) 2 Ce(NO 3 ) 6 ] (CAN).
Cu-catalyzed arylation of 1-acyl-1H-1,2,3-Benzotriazoles via C–N activation
作者:Wenying Zhang、Yangyang Wang、Xiangru Jia、Zhengyin Du、Ying Fu
DOI:10.1016/j.jorganchem.2019.05.013
日期:2019.9
An efficient copper-catalyzed arylationreaction of 1-acyl-1H-1,2,3-benzotriazoles with diaryliodonium salts via C–N activation is explored. The reaction is conducted regioselectively to form 1-aryl-1H-1,2,3-benzotriazoles in MeCN at 80 °C in the presence of cesium carbonate. 29 examples are given with the product yield of up to 84%. The probable reaction mechanism is proposed.
通过CN活化研究了1-酰基-1 H -1,2,3-苯并三唑与二芳基碘鎓盐的有效铜催化芳基化反应。在碳酸铯存在下,于80℃在MeCN中区域选择性地进行反应以形成1-芳基-1 H -1,2,3-苯并三唑。给出了29个实例,产品收率高达84%。提出了可能的反应机理。