Bioactive azaarene-substituted lactic acids, β-hydroxy esters, 3-hydroxy-2H-indol-2-ones, and 2alkenylazaarenes were prepared in moderate-to-excellent yields via C(sp 3 )-H functionalization of methyl azaarenes with carbonyl compounds in the presence of iron(II) acetate as an inexpensive, nontoxic, efficient catalyst. The application of this atom-, step-economic, and environmentally friendly method was demonstrated by a gram-scale synthesis of 3-[(E)-2-(7-chloroquinolin-2-yl)vinyl]benzaldehyde, a key intermediate of leukotriene receptor antagonist (Montelukast).

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A highly enantioselective aminalization of 2‐aminobenzenesulfonamides and aldehydes catalyzed by a novel cyclopentadiene‐based chiral carboxylic acid has been realized. The cost‐effective and readily synthesized cyclopentadiene‐based chiral carboxylic acid was found to be a highly reactive Brønsted acid for this transformation, affording benzothiadiazine class of cyclic aminals with up to 98 % ee.