The synthesis and biological activity in the rat passive cutaneous anaphylaxis (PCA) test of a new class of compounds, 1-[(ethoxyamino)methyl]-1,3,4,5-tetrahydro-7,8-dimethoxy-2-benzoxepins, are reported. These compounds are synthesized from the adduct of 1-(bromomethyl)-1,3,4,5-tetrahydro-7,8-dimethoxy-2-benzoxepins, are reported. These compounds are synthesized from the adduct of 1-(bromomethyl)-1,3,4,5-tetrahydro-7,8-dimethoxy-2-benzoxepin and ethylene glycol or chloroethanol. The influence of the amine function on activity in the rat PCA is discussed. Aryl- or heteroarylpiperazines favor activity with this class of compounds.