6264-98-8Relevant academic research and scientific papers
Copper(ii)-catalyzed Chan-Lam cross-coupling: chemoselective N-arylation of aminophenols
Siva Reddy,Ranjith Reddy,Nageswar Rao,Jaladanki, Chaitanya K.,Bharatam, Prasad V.,Lam, Patrick Y. S.,Das, Parthasarathi
supporting information, p. 801 - 806 (2017/02/05)
Copper(ii)-catalyzed boronic acid promoted chemoselective N-arylation of unprotected aminophenols has been developed. Selective N-arylation of 3-aminophenol is achieved with a Cu(OAc)2/AgOAc combination in MeOH at rt, whereas the chemoselective N-arylated products of 4-aminophenol can be obtained with a Cu(OAc)2/Cs2CO3 system and benzoic acid as an additive. These ligand-free conditions and “open-flask” chemistry are robust and compatible with a wide range of functional groups. The mechanistic investigation for this selective N-arylation has been studied by considering Density Functional Theory (DFT) calculations.
Orthogonal Cu- and Pd-based catalyst systems for the O- and N-arylation of aminophenols
Maiti, Debabrata,Buchwald, Stephen L.
supporting information; experimental part, p. 17423 - 17429 (2010/03/25)
O- or N-arylated aminophenol products constitute a common structural motif in various potentially useful therapeutic agents and/or drug candidates. We have developed a complementary set of Cu- and Pd-based catalyst systems for the selective O- and N-arylation of unprotected aminophenols using aryl halides. Selective O-arylation of 3- and 4-aminophenols is achieved with copper-catalyzed methods employing picolinic acid or CyDMEDA, trans-N,N′-dimethyl-1,2- cyclohexanediamine, respectively, as the ligand. The selective formation of N-arylated products of 3- and 4-aminophenols can be obtained with BrettPhos precatalyst, a biarylmonophosphine-based palladium catalyst. 2-Aminophenol can be selectively N-arylated with CuI, although no system for the selective O-arylation could be found. Coupling partners with diverse electronic properties and a variety of functional groups can be selectively transformed under these conditions.
Manufacture of arylamines
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, (2008/06/13)
Arylamines are manufactured by reacting alcohols with amines in the presence of phosphorus-III compounds. The arylamines I manufactured by the process of the invention are intermediates for the manufacture of crop protection agents, optical brighteners, especially amino-coumarin derivatives, and dyes, especially of the xanthene, pyronine, rhodamine, oxazine, azo, triphenylmethane and diphenylmethane series.
