Diaryliodoniums by Rhodium(III)-Catalyzed CH Activation: Mild Synthesis and Diversified Functionalizations
作者:Fang Xie、Zhipeng Zhang、Xinzhang Yu、Guodong Tang、Xingwei Li
DOI:10.1002/anie.201502278
日期:2015.6.15
Diaryliodonium salts play an increasingly important role as an aryl source. Reported is the first synthesis of diaryliodoniums by rhodium(III)‐catalyzed CH hyperiodination of electron‐poor arenes under chelation assistance. This CI coupling reaction occurred at room temperature with high regio‐selectivity and functional‐group compatibility. Subsequent diversified nucleophilic functionalization of
Rhodium(III)-Catalyzed Diastereoselective Ring-Opening of 7-Azabenzonorbornadienes with Aromatic Ketoximes: Synthesis of Benzophenanthridine Derivatives
A rhodium(III)-catalyzed redox-neutral ring-opening of 7-azabenzonorbornadienes with aromatic ketoximes giving 2-arylated hydronaphthylamines in a highly diastereoselective manner is described. Later, the 2-arylated hydronaphthylamines were converted into highly sensitive 13,14-dehydro benzophenanthridine derivatives by HCl hydrolysis. Further, 13,14-dehydro benzophenanthridines were aromatized into
Novel thiophene derivatives and methods for producing the same
申请人:SEITETSU KAGAKU CO., LTD.
公开号:EP0245835A2
公开(公告)日:1987-11-19
Novel compounds, 2-(α-alkoxyimino) ethylthiophenes are susceptible to electrophilic substitution reactions, and the acetylation, nitration, sulfonation and halogenation of the compounds provide 5-acetyl-2-(a-alkoxyimino)-ethylthiophenes, 5-nitro-2-(a-alkoxyimino)ethylthiophenes, 5-(a-alkoxyiminolethyl-2-thiophenesulfonic acid and 5-halo-2-(a-alkoxyimino)ethylthiophenes, respectively.
The hydrolysis of 5-acetyl-2-(a-alkoxyimino)-ethylthiophenes readily provides a known compound, 2,5- diacetylthiophene which is an important intermediate for the production of medicines, whereas the haloform reaction provides novel compounds, 5-(a-alkoxyimino)ethyl-2-thiophenecarboxylic acids, the hydrolysis of which compounds readily provides a known compound, 5-acetyl-2-thiophenecarboxylic acids, an important intermediate for the production of medicines.
The hydrolysis of 5-(a-alkoxyimino)ethyl-2-thiophene- sulfonic acids and their salts provide novel 5-acetyl-2-thiophenesulfonic acid and its salts, respectively.
Novel compounds, 2-(a-alkoxyimino)ethylthiophenes are obtained either by 0-alkylation of 2-acetylthiophene oxime or by directly reacting 2-acetylthiophene with an 0-alkylhydroxylamine.