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4,5,6-Triaminopyrimidine (pyrimidine-4,5,6-triamine) is a pyrimidine derivative. It can be used in the preparation of 5-pyrimidine-6-yloxypyrazole and pyrazole derivatives, as well as in the preparation of nanofiltration membranes and surface-modified substrates for compounds.

Step 4: Wetted 4,6-diamino-5-nitrosopyrimidine was loaded into a reaction column. 400 mL of methanol and 4 g of 5% palladium carbon catalyst were added to the autoclave and the reaction was stirred at room temperature in a hydrogen atmosphere. Upon completion of the reaction, methanol was removed by evaporating the filtrate. The resulting 4,5,6-triaminopyrimidine can be used directly in the subsequent reaction steps without further purification in 95% yield.

[1] Nucleosides, Nucleotides and Nucleic Acids, 2009, vol. 28, # 5-7, p. 550 - 585
[2] Patent: CN103709164, 2016, B. Location in patent: Paragraph 0034; 0105; 0110-0111
[3] Journal of the Chemical Society, 1956, p. 4106,4111