developed for the hydroamination of alkynes by 1,1-disubstituted hydrazines. The catalyses are facile with terminal alkynes and some internal alkynes. If the hydrazine bears an aryl group, Fischer cyclization can occur in a one-pot procedure. In addition, reactions with acetylene to produce a plethora of hydrazones are described. Catalytic reactions involving acetylene and substituted hydrazines are complete
Bis(amidate)bis(amido) Titanium Complex: A Regioselective Intermolecular Alkyne Hydroamination Catalyst
作者:Jacky C.-H. Yim、Jason A. Bexrud、Rashidat O. Ayinla、David C. Leitch、Laurel L. Schafer
DOI:10.1021/jo402668q
日期:2014.3.7
o) titanium precatalyst for the anti-Markovnikov hydroamination of alkynes is reported. Hydroamination of terminal and internal alkynes with primary alkylamines, arylamines, and hydrazines is promoted by 5–10 mol % of Ti catalyst. Various functional groups are tolerated including esters, protected alcohols, and imines. The in situ generated complex shows comparable catalytic activity, demonstrating
A General Study of[(η5-Cp′)2Ti(η2-Me3SiC2SiMe3)]-Catalyzed Hydroamination of Terminal Alkynes: Regioselective Formation of Markovnikov and Anti-Markovnikov Products and Mechanistic Explanation (Cp′=C5H5, C5H4Et, C5Me5)
作者:Annegret Tillack、Haijun Jiao、Ivette Garcia Castro、Christian G. Hartung、Matthias Beller
DOI:10.1002/chem.200305674
日期:2004.5.17
A generalstudy of the regioselectivehydroamination of terminalalkynes in the presence of [(eta5-Cp)2Ti(eta2-Me3SiC2SiMe3)] (1), [(eta5-CpEt)2Ti(eta2-Me3SiC2SiMe3)] (CpEt=ethylcyclopentadienyl) (2), and [(eta5-Cp*)2Ti(eta2-Me3SiC2SiMe3)] (Cp*=pentamethylcyclopentadienyl) (3) is presented. While aliphatic amines give mainly the anti-Markovnikovproducts, anilines and aryl hydrazines yield the Markovnikov
Regiochemistry of the microwave-assisted reaction between aromatic amines and α-bromoketones to yield substituted 1H-indoles
作者:Yosu Vara、Eneko Aldaba、Ana Arrieta、José L. Pizarro、María I. Arriortua、Fernando P. Cossío
DOI:10.1039/b719641e
日期:——
Bischler (or Bischler-Mohlau) reaction between aromaticamines and alpha-bromoketones has been studied by computational and experimental techniques. It has been found that in many cases the reaction yields are improved under microwave irradiation and working in the absence of solvent. When di- and trisubstituted amines are used as substrates the regioselectivity of the reaction is different to that obtained
An Admix Approach To Determine Counter Anion Effects on Metal-Free Arylation Reactions with Diaryliodonium Salts
作者:Thomas L. Seidl、David R. Stuart
DOI:10.1021/acs.joc.7b01599
日期:2017.11.17
counter anions in metal-free arylation reactions of diaryliodoniumsalts is described. This approach avoids the independent synthesis of individual diaryliodoniumsalts and potentially enables assessment of a large number of different counter anions, including those that are synthetically challenging to install. Diaryliodonium tosylate salts serve as a general precursor for this approach, and an azide