Abstract
α-Bromoarylacetohydrazides were converted by pyridine into the corresponding arylacetylhydrazinopyridinium salts. Treated with triethylamine, these pyridinium salts afford 4-aryl-1,3-diaminohydantoins. The study of the mechanism of this unexpected reaction lead us to extend its scope to 4-arylhydantoins bearing two different substituted amino groups on nitrogens 1 and 3.
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