Innovative cascade reaction for 2H-indazole derivative synthesis

Area of Science:

• Synthetic Organic Chemistry
• Medicinal Chemistry

Background:

• Multicomponent reactions (MCRs) offer efficient synthesis of valuable compounds.
• One-pot strategies minimize waste and enhance economic viability in chemical manufacturing.

Purpose of the Study:

• To develop a straightforward, stereoselective synthesis of substituted 2H-indazole analogues.
• To establish an efficient method for producing pharmaceutical and agrochemical intermediates.

Main Methods:

• Synthesis of functionalized 3-bromo-4-((methylthio)methyl) derivatives using DMSO and TMSOTf.
• Palladium-catalyzed coupling of derivatives using t-Bu3PHBF4 ligand and Cs2CO3 base at 100°C.
• Structural confirmation via NMR (1H, 13C) and LCMS.

Main Results:

• Achieved yields up to 80% for 2H-indazole derivatives.
• Demonstrated efficient synthesis of analogues with C-6 electron-releasing groups.
• Comparative analysis of halogen derivatives across various solvents.

Conclusions:

• The developed one-pot method provides a cost-effective route to diverse 2H-indazole analogues.
• This approach aligns with green chemistry principles by reducing waste.
• The synthesized compounds hold potential for applications in pharmaceuticals and agrochemicals.