Pd-Catalyzed N-Arylation of Heteroarylamines was written by Yin, Jingjun;Zhao, Matthew M.;Huffman, Mark A.;McNamara, James M.. And the article was included in Organic Letters in 2002.Reference of 3528-58-3 This article mentions the following:
The palladium-catalyzed N-(hetero)arylation of a number of heteroarylamines including 2-aminopyridines, 2-aminothiazoles, and their analogs has been realized using Xantphos as the ligand. Weak bases such as Cs2CO3, Na2CO3, and K3PO4 were used in most cases to allow for the introduction of functional groups. Choice of the base and solvent was critical for the success of these reactions. In the experiment, the researchers used many compounds, for example, 1-Ethyl-1H-pyrazol-5-amine (cas: 3528-58-3Reference of 3528-58-3).
1-Ethyl-1H-pyrazol-5-amine (cas: 3528-58-3) belongs to pyrazole derivatives. Pyrazoles, a five-membered heterocycle containing two adjacent nitrogen atoms, are the core structures found in a number of molecules that possess a wide range of pharmaceutical and agricultural activities. The pyrazole ring is resistant to oxidation and reduction but the groups, such as alkyl and formyl attached to the ring, are oxidized to respective acids. Only electrolytic oxidation, ozonolysis, and a strong base cause ring opening.Reference of 3528-58-3
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics