本文描述了铁/光氧化还原双催化酰基氮烯的形成以及酰基氮烯在构建各种 C-O 键中对苯酞的应用。开发的反应从N -methoxyl-2-alkylbenzamides 开始。机理调查表明,该反应涉及基于铁氮烯的氢原子提取 (HAA)、自由基-极性交叉和O-亲核 S N 1。值得注意的是,未观察到以前出版物中经常报道的自由基反弹。该反应代表了基于酰基氮烯的苯酞合成的第一个例子。此外,它还作为合成3-丁基苯酞(NBP)、沙利度胺、Pomalyst和Otezia等市售药物的补充剂。
Photoinduced Aerobic Iodoarene‐Catalyzed Spirocyclization of
N
‐Oxy‐amides to N‐Fused Spirolactams**
摘要:
AbstractIodoarene catalysis is a powerful methodology that usually requires an excess of oxidant, or of redox mediator if the terminal oxidant is dioxygen, to generate the key hypervalent iodine intermediate to proceed efficiently. We report that, using the spiro‐cyclization of amides as a benchmark reaction, aerobic iodoarene catalysis can be enabled by relying on a pyrylium photocatalyst under blue light irradiation. This unprecedented dual organocatalytic system allows the use of low catalytic loading of both catalysts under very mild operating conditions.
N-alkoxy-n-acylnitrenium ions in intramolecular aromatic addition reactions
作者:Stephen A. Glover、Andre Goosen、Cedric V. McClei、Johan L. Schoonraad
DOI:10.1016/s0040-4020(01)81665-3
日期:——
solvents. These intermediates readily cyclise onto aromatic nuclei on alkozy side-chains to give benzoxazines and benzoxazepines and on the acyl side-chains to give γ, δ and ϵ benzolactams. Spirane products are formed by ipso addition When a 4-methoxy substituent ia present on the side-chain aromatic rings. The yields and regioselectivities of these reactions have been ascribed to different transition structures
First hypervalent iodine(<scp>iii</scp>)-catalyzed C–N bond forming reaction: catalytic spirocyclization of amides to N-fused spirolactams
作者:Toshifumi Dohi、Akinobu Maruyama、Yutaka Minamitsuji、Naoko Takenaga、Yasuyuki Kita
DOI:10.1039/b616510a
日期:——
A protic solvent, 2,2,2-trifluoroethanol (CF3CH2OH), was successfully introduced into hypervalent iodine(III)-involved catalytic cycles as an effective solvent, and the first iodoarene-catalyzed intramolecular carbonânitrogen bond forming reaction was achieved under strong acid-free and mild conditions.
在无强酸和温和的条件下,首次实现了碘烯烃催化的分子内碳氮键形成反应。
Designer μ-oxo-bridged hypervalent iodine(iii) organocatalysts for greener oxidations
作者:Toshifumi Dohi、Naoko Takenaga、Kei-ichiro Fukushima、Teruyoshi Uchiyama、Daishi Kato、Shiro Motoo、Hiromichi Fujioka、Yasuyuki Kita
DOI:10.1039/c0cc03213a
日期:——
The in situ generated mu-oxo-bridged reactive hypervalentiodine(iii) species 1 or their analogues are introduced as more efficient organocatalysts for the catalytic strategy for realizing practical and greener oxidations.
Electrophilic aromatic substitution with N-methoxy-N-acylnitrenium ions generated from N-chloro-N-methoxy amides: syntheses of nitrogen heterocyclic compounds bearing a N-methoxy amide group