The tributyltin radical‐induced cyclization of N‐(2‐bromophenyl)‐Nbutyl‐1H‐1‐methylimidazole‐4‐carbox‐amide 3 gave 5‐butyl‐3‐methyl‐3H‐imidazo[4,5‐c]quinolin‐4(5H)‐one 5 via [1,2]‐acyl rearrangement.
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Suzuki et al. (1993) studied this question.
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