4-Bromopyrazole

It is mainly employed in coupling reactions to form the core intermediate, (R)-3-(4-bromo-1H-pyrazol-1-yl)-3-cyclopentylpropanenitrile. 4-Bromopyrazole is a key building block employed to synthesize Ruxolitinib, a JAK1/2 inhibitor, serving as the raw material to introduce the functionalized pyrazole ring.

API Name Ruxolitinib
CAS No 2075-45-8
Molecular Formula C3H3BrN2
Molecular Weight 146.97 g/mol
Synonyms 4-bromo-1H-pyrazole