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Reaction with N-Bromosuccinimide in carbon tetrachloride places an allylic bromine atom in '1.2' and further bromination with bromine in pentane - methylene chloride gives the tribromide '1.3'.
Polypyridine complex 43 was treated with N-Bromosuccinimide in wet tetrahydrofuran followed by pyridine to generate the acylmethylpyridinium salt 44 which can then undergo the macrocyclization under standard conditions to yield the desired product 45.