Room-Temperature Palladium-Catalyzed Amination of Aryl Bromides and Chlorides and Extended Scope of Aromatic C−N Bond Formation with a Commercial Ligand
作者:John F. Hartwig、Motoi Kawatsura、Sheila I. Hauck、Kevin H. Shaughnessy、Luis M. Alcazar-Roman
DOI:10.1021/jo990408i
日期:1999.7.1
The reactions of aryl bromides with amines occurs at roomtemperature when using Pd(0) and P(t-Bu)(3) in a 1:1 ratio, and the reactions of arylchlorides occur at roomtemperature or 70 degrees C. The arylation of indoles and the new arylation of carbamates also occur when using P(t-Bu)(3) as ligand.
Transition metal-catalyzed process for preparing N-aryl amine compounds
申请人:Yale University
公开号:US06100398A1
公开(公告)日:2000-08-08
Disclosed is a process for the preparation of N-aryl amine compounds, comprising reacting an amine compound with an arylating compound in the presence of a base and a transition metal catalyst under reaction conditions effective to form an N-aryl amine compound, the transition metal catalyst comprising a Group 8 metal and P(t-Bu).sub.3 as a ligand, and wherein the ratio of the ligand to the Group 8 metal is in the range of about 3:1 to about 0.25:1, and wherein the reaction temperature is less than 100.degree. C. The process of the present invention provides a useful general method of N-arylation for the manufacture of pharmaceuticals, polymers, and the like.
The structure ligation relationship (SLR) of amino acids (AAs) for the cross-coupling aminations was examined. While AA ligated C–N cross-couplings under Pd and Ni catalysis were minor or ineffective, the AA ligated Cu-catalyzed C–N cross-couplings were promising particularly with the use of l-methionine. The roles of −NH2, −CO2H, and −S– of l-methionine were investigated and found critical for their
Noncataleptogenic, centrally acting dopamine D-2 and serotonin 5-HT2 antagonists within a series of 3-substituted 1-(4-fluorophenyl)-1H-indoles
作者:Jens Perregaard、Joern Arnt、Klaus P. Boegesoe、John Hyttel、Connie Sanchez
DOI:10.1021/jm00084a014
日期:1992.3
antagonism. Piperazinyl and tetrahydropyridyl indoles were cataleptogenic, while piperidylsubstituted indoles surprisingly were found to be noncataleptogenic or only weakly cataleptogenic. Noncataleptogenic piperidyl derivatives also failed to block dopaminergic-mediated stereotypies, that is methyl phenidate-induced gnawing behavior in mice. These profiles resemble that of the atypical neuroleptic clozapine