Abstract
Under basic catalysis conditions the reaction of 4- and 4'-substituted chalcones with o-phenylenediamine leads to 2,3-dihydro-2,4-diaryl-1H-1,5-benzodiazepines; β-amino adducts, the ability of which to undergo intramolecular condensation increases as the basicity of the catalyst is increased, are formed as intermediates. A different pathway for the process (the formation of an azomethine) is observed in the reaction with cinnamaldehyde. It is concluded that conformational factors play a primary role in the direction of the reaction.
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