A convenient protocol for synthesis of unsymmetrical 2-methylpyridines from acetyl ketones, ammonium salts and tertiary amines is described. The construction of two C–C bonds and two C–N bonds via [2 + 2 + 1 + 1] four-component domino cyclization reaction is achieved using Cu(OTf) as catalyst in one pot. This cyclization reaction shows good selectivity and produces multisubstituted 2-methylpyridine derivatives in good yields with various functional groups.
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Ma et al. (2024) studied this question.
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