The antiallergic action of a series of novel mono-O-substituted trimethylhy
droquinones was investigated. Among this series of the compounds, 4-[4-[4-(
diphenylmethyl)-1-piperazinyl]butoxy]-2,3,6-trimethylphenol (compound 3) sh
owed a potent antihistaminic action (pA(2)=7.11) and an antiasthmatic actio
n (100 mg/kg p. o.) on sensitized guinea pigs. Moreover, this compound exhi
bited a strong eosinophilic infiltration inhibiting action on sensitized mi
ce (100 mg/kg p. o.). (C) 1998 Elsevier Science Ltd. All rights reserved.