How is 1H-Pyrazole-4-carboxylic acid (CAS: 37718-11-9) typically synthesized?

1H-Pyrazole-4-carboxylic acid can be synthesized via a multi-step route starting from 2-bromo-1H-pyrazole or other precursors. Common methods include the condensation of 2-bromo-1H-pyrazole with carboxylic acids or the reduction of 1H-pyrazole-4-carboxaldehyde. The synthesis often uses conditions such as sodium hydride or sodium borohydride as reducing agents, and the process yields can range from 50% to 75%, depending on the specific reaction conditions and purity of starting materials.