Experimental synthesis study demonstrates metal-free halogenation of 2-methylquinolines using potassium halides, indicating a sustainable route to functional pharmaceutical building blocks.
A metal‐free, operationally straightforward and environmentally benign halogenation of substituted 2‐methylquinolines has been accomplished with inexpensive potassium halides as halogen sources under ambient conditions. This protocol bypasses conventional metal catalysis and proceeds efficiently at room temperature with broad substrate compatibility. The synthetic utility is demonstrated by gram‐scale preparation, facile product derivatization, and good reusability of the Brønsted acidic ionic liquid (BAIL) promoter, which remains highly active for at least four cycles. Mechanistic studies support a free‐radical pathway initiated by in situ generated halogen radicals. This work offers a practical, mild, and sustainable route to 2‐halomethylquinolines—versatile building blocks for pharmaceuticals and functional materials.
No takes yet. Share an insight, caveat, or question.
Li et al. (2026) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: