[Azoles. 12. Pyrazole carbolic acid thioamides]

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Pharmacology

Context:

• The Willgerodt-Kindler reaction is a versatile method for synthesizing thioamides.
• Pyrazole derivatives are known for diverse biological activities.
• Tuberculosis and inflammation remain significant global health challenges.

Purpose:

• To synthesize novel morpholide, N-methylpiperazide, piperidide, and pyrrolidide derivatives of pyrazole thioacetic and pyrazole carbonic acids.
• To investigate the intermediate oxothioamides formed during the synthesis.
• To evaluate the antimycobacterial and anti-inflammatory potential of the synthesized compounds.

Summary:

• The study successfully synthesized a series of pyrazole derivatives using the Willgerodt-Kindler procedure.
• Intermediate oxothioamides were identified during the synthetic pathway.
• Compounds 4, 5, 8, 9, 11, 14, and 17 showed no activity against Mycobacterium tuberculosis H37Rv.
• Thioamides 4, 8, and 11 exhibited low toxicity and demonstrated anti-inflammatory effects, inhibiting carrageenan-induced paw edema in rats to a lesser extent than phenylbutazone and indomethacin.

Impact:

• This research expands the library of pyrazole-based compounds with potential therapeutic applications.
• The findings contribute to understanding the structure-activity relationships of pyrazole derivatives in inflammation.
• Identified compounds offer a starting point for developing new anti-inflammatory agents.