10461-91-3Relevant academic research and scientific papers
Regioselective preparation of pyridin-2-yl ureas from 2-chloropyridines catalyzed by Pd(0)
Abad, Antonio,Agullo, Consuelo,Cunat, Ana Carmen,Vilanova, Cristina
, p. 915 - 924 (2005)
The palladium-catalyzed ureidation reaction of 2-chloropyridines can be regioselectively performed in good yield, with both aryl and aliphatic ureas, using xantphos as the ligand, Pd(OAc)2 as the source of palladium, NaOt-Bu/H2O or N
Synthesis of unsymmetrical urea from aryl- or pyridyl carboxamides and aminopyridines using PhI(OAc)2via in situformation of aryl- or pyridyl isocyanates
Hunjan, Mandeep Kaur,Laha, Joydev K.,Singh, Neha
, p. 18815 - 18823 (2021/10/26)
A tandem synthesis of unsymmetrical ureas (N-aryl-N′-pyridylurea andN,N′-bipyridylurea) from aryl- or pyridyl carboxamides and aminopyridinesviaHofmann rearrangement has been reported. In particular, benzamides, picolinamide, nicotinamide, and isonicotinamide generate reactive intermediate isocyanates,in situ, in the presence of PhI(OAc)2, which upon further reaction with aminopyridines form urea derivatives. As the formation of pyridylisocyanates from their corresponding carboxamidesviaHofmann rearrangement remained unexplored previously, attempts have been made to trap the isocyanates. While the three pyridylisocyanates were trapped as their corresponding carbamates, 3-pyridylisocyanate was isolated and characterized. Unlike closely related previous methods reported for urea synthesis, the current method avoids direct use of isocyanates or eliminates the use of toxic phosgene for thein situgeneration of isocyanates.
Metal-free synthesis of pyridin-2-yl ureas from 2-aminopyridinium salts
Saroj,Patel, Om P.S.,Rangan, Krishnan,Kumar, Anil
, (2019/07/23)
An unprecedented base promoted domino approach has been developed for the synthesis of pyridin-2-yl urea derivatives via the reaction of 2-aminopyridinium salts and arylamines. The developed strategy tolerated a wide range of functional groups and afforded pyridin-2-yl ureas in moderate to good yields. The reaction was postulated to involve tandem cyclization, intermolecular nucleophilic addition, ring opening, and demethylation.
Synthesis of substituted heterocyclic ureas by selenium-catalysed carbonylation using carbon monoxide
Ling, Gang,Chen, Jingzhu,Lu, Shiwei
, p. 442 - 444 (2007/10/03)
A series of commercially useful substituted heterocyclic ureas have been synthesised via selenium-catalysed reductive carbonylation of substituted nitrobenzezes with aminopyridine or aminopyrimidine derivatives as co-reagents and carbon monoxide as carbonylating reagent.
