Abstract
An efficient catalytic borylation reaction of aryl bromides in water based on Pd catalysis under micellar conditions is presented. The peculiar combination of the proper Pd precursor with a Sphos ligand and a hindered lipophilic base ensures good yields in the synthesis of a wide range of boronic esters, even for heteroaryl derivatives with a good purity profile. The method is specifically developed for the in situ preparation of boronic esters that are directly converted into examples of relevant active pharmaceutical ingredient intermediates through cross-coupling reactions or via oxidation to phenols.
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