New protocols for the synthesis of 3,4-annulated and 4-substituted quinolines from β-bromo α,β-unsaturated aldehydes and 1-bromo-2-nitrobenzene or 2-bromoacetanilide
The palladium-mediated Ullmann cross-coupling of readily available β-bromo-α,β-unsaturated aldehydes of the general form 2 with 1-bromo-2-nitrobenzene (3, X = Br) delivers products, 4, that undergo reductive cyclization to novel quinolines (5) upon
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