Redox‐Neutral Selenium‐Catalysed Isomerisation of
para
‐Hydroxamic Acids into
para
‐Aminophenols
摘要:
AbstractA selenium‐catalysed para‐hydroxylation of N‐aryl‐hydroxamic acids is reported. Mechanistically, the reaction comprises an N−O bond cleavage and consecutive selenium‐induced [2,3]‐rearrangement to deliver para‐hydroxyaniline derivatives. The mechanism is studied through both 18O‐crossover experiments as well as quantum chemical calculations. This redox‐neutral transformation provides an unconventional synthetic approach to para‐aminophenols.
Redox‐Neutral Selenium‐Catalysed Isomerisation of
para
‐Hydroxamic Acids into
para
‐Aminophenols
摘要:
AbstractA selenium‐catalysed para‐hydroxylation of N‐aryl‐hydroxamic acids is reported. Mechanistically, the reaction comprises an N−O bond cleavage and consecutive selenium‐induced [2,3]‐rearrangement to deliver para‐hydroxyaniline derivatives. The mechanism is studied through both 18O‐crossover experiments as well as quantum chemical calculations. This redox‐neutral transformation provides an unconventional synthetic approach to para‐aminophenols.
Treatment of N-aryl-N-hydroxyamides with diethylaminosulfurtrifluoride (DAST) under conventional reaction conditions results in removal of the hydroxy function and introduction of a fluorine atom at the para position of the aromatic ring, in high yield.
A novel synthesis of indole derivatives by the reaction of<i>N</i>-arylhydroxamic acids with malononitrile
作者:Yukihiko Tomioka、Kimiko Ohkubo、Hiroshi Maruoka
DOI:10.1002/jhet.5570440222
日期:2007.3
An approach to indole derivatives fromN-arylhydroxamicacids and malononitrile via a [3,3]-sigmatropic rearrangement and intramolecular cyclization is described. Reactions of N-arylhydroxamicacids 1a-c, 2a-c and 3a-c with malononitrile in the presence of triethylamine at room temperature gave the corresponding α-cyanoacetamide derivatives 4a-c, 5a-c, 6a-c, 7a-c and 8a-c. Thermal treatment of 4a-c
The solvolysis of N-acetoxy-1-N-acetylaminonaphthalene and N-acetoxy-2-N-acetylaminonaphthalene: divergent chemistry and mutagenic activity
作者:Graham R. Underwood、Catherine M. Davidson
DOI:10.1039/c39850000555
日期:——
Upon solvolysis in neutral 40% aqueous acetone, N-acetoxy-1-N- and N-acetoxy-2-N-acetylaminonaphthalene exhibit completely different modes of reaction; the former reacts with nitrenium ion formation, while the latter undergoes acyl oxygen scission.
[EN] NAPHTALENE AMINOALKYLENE ETHERS AND THIOETHERS, AND THEIR PHARMA CEUTICAL USES
申请人:——
公开号:WO1984004245A1
公开(公告)日:1984-11-08
(EN) A class of naphthalene aminoalkylene ether and thioether compounds exhibiting pharmacological activity including anti-secretory and anti-ulcerogenic activity, pharmaceutical compositions comprising these compounds, and methods for the treatment of gastrointestinal hyperacidity and ulcerogenic disorders in mammals using said compositions. (FR) Classe de composés thioéthers et éthers d"aminoalcènes de naphtalène possédant une activité pharmacologique, y compris une activité anti-sécrétrice et anti-ulcérogène, compositions pharmaceutiques comportant ces composés et procédés pour le traitement de l"hyperacidité gastro-intestinale et d"affections ulcérogènes chez les mammifères utilisant lesdites compositions.