The Ortho Substitution Rearrangement versus β-Elimination of Certain Quaternary Ammonium Ions with Sodium Amide. Extension of the Method of Synthesis of Vicinal Alkyl Aromatic Derivatives1
Iron-Catalyzed, Hydrogen-Mediated Reductive Cyclization of 1,6-Enynes and Diynes: Evidence for Bis(imino)pyridine Ligand Participation
作者:Kevin T. Sylvester、Paul J. Chirik
DOI:10.1021/ja902478p
日期:2009.7.1
The bis(imino)pyridine iron dinitrogen complex (((i)Pr)PDI)Fe(N(2))(2) catalyzes the hydrogen-mediated reductivecyclization of enynes and diynes with turnover frequencies comparable to those of established precious metal catalysts. Amino, oxygenated, and carbon-based substrates are readily cyclized to the corresponding hetero- and carbocycles with 5 mol % iron and 4 atm H(2) at 23 degrees C. Stoichiometric
convenient method for the synthesis of 3-methylthioindoles has been established which does not use smelly compounds such as thiol derivatives. The method, which introduces an alkyl- or arylthio-group into the C(3)-position of the indole skeleton, was extended to the direct introduction of a methylthio or bromo group at the C(2)-position using 3-methylthioindoles. No dimerization occurred, and the reaction
Borrowing Hydrogen in Water and Ionic Liquids: Iridium-Catalyzed Alkylation of Amines with Alcohols
作者:Ourida Saidi、A. John Blacker、Gareth W. Lamb、Stephen P. Marsden、James E. Taylor、Jonathan M. J. Williams
DOI:10.1021/op100024j
日期:2010.7.16
The use of [Cp*IrI2]2 as an efficient catalyst for the alkylation of amines by alcohols in either water or ionic liquid is described. Primary amines are converted into secondaryamines, and secondaryamines into tertiaryamines in the absence of base, and the chemistry has been applied to the synthesis of the analgesic fentanyl. The conversion of primary amines into N-heterocycles by the reaction with
描述了使用[Cp * IrI 2 ] 2作为在水或离子液体中通过醇使胺烷基化的有效催化剂。在不存在碱的情况下,伯胺被转化为仲胺,仲胺被转化为叔胺,并且该化学方法已经应用于止痛药芬太尼的合成。还描述了通过与二醇反应将伯胺转化为N-杂环以及磺酰胺的N-烷基化。
N−N Bond Formation Using an Iodonitrene as an Umpolung of Ammonia: Straightforward and Chemoselective Synthesis of Hydrazinium Salts
作者:Arianna Tota、Marco Colella、Claudia Carlucci、Andrea Aramini、Guy Clarkson、Leonardo Degennaro、James A. Bull、Renzo Luisi
DOI:10.1002/adsc.202001047
日期:2021.1.5
The formation of hydrazinium salts by N−N bond formation has typically involved the use of hazardous and difficult to handle reagents. Here, mild and operationally simple conditions for the synthesis of hydrazinium salts are reported. Electrophilic nitrogen transfer to the nitrogen atom of tertiary amines is achieved using iodosylbenzene as oxidant and ammonium carbamate as the N‐source. The resulting
Nickel-Catalyzed Alkylarylation of Activated Alkenes with Benzyl-amines via C−N Bond Activation
作者:Hui Yu、Bin Hu、Hanmin Huang
DOI:10.1002/chem.201800543
日期:2018.5.17
A nickel‐catalyzed alkylarylation of active alkenes with tertiary benzylamines was achieved by charge‐transfer‐complex promoted C−N bond activation. The reaction proceeded through initial Ni‐catalyzed C−N bond activation, followed by sequential radical addition, redox and proton abstraction with cleaved amine moiety in the absence of oxidant, and provides an efficient method to prepare various alkyl‐substituted