A series of urethane type derivatives of ethylene diamine (EDA) was synthesised and tested as inhibitors of monoamine oxidase (MAO) A and B. Nature of aromatic ring and a position of substituents in it were important for the inhibitory activity. Chlorobenzyloxycarbonyl-EDA derivatives exhibited selective inhibition of MAO-A with 3,4-Cl2-C6H4CH2OCO-EDA being a most potent and selective MAO-A inhibitor (IC50 4 microM). Within the compounds studied, 3,4-dichloro-benzyloxycarbonyl-EDA exhibited most potent inhibition of MAO-A. This compound inhibited the activity of rat liver MAO-A non-competitively with Ki (slope) value of 3.6 microM, whereas the inhibition of rat liver MAO-B was competitive with Ki (slope) value of 56 microM (not shown). 2.4-Dichlorobenzyloxycarbonyl-EDA also inhibited rat liver MAO-A in a non-competitive manner with Ki of 14.6 microM.
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