In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 28466-26-4, name is 4-Aminopyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. Computed Properties of C3H5N3
Imine (I1) A solution of 4-aminopyrazole (10) (10.5 g, 126 mmol), ethylacetoacetate (18.0 g, 140 mmol, 1.05 eq.) and a catalytic amount of para-toluenesulfonic acid monohydrate (1.3 g, 6.65 mmol, 5%) in 100 mL of benzene was refluxed with a Dean-Stark trap for about 1 hour. The end of reaction checked by TLC (Ethylacetate/Hexane 1/1, 4-aminopyrazole Rf=0.1, imine Rf=0.5, UV active, brown after overnight). Solvents were removed under vacuum and the imine was purified by running through a short silica chromatography column to give the desired product (11) as a tan solid (22.4 g, 125 mmol, 91%). GC/MS: m/z=195 (100%).
The synthetic route of 28466-26-4 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Neurocrine Biosciences, Inc.; US6531475; (2003); B1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics