ANALOGIFREMGANGSMAADE TIL FREMSTILLING AF TRANS-3-(4-OXO-4H-QUINAZOLIN-3-YL)-2-PROPENSYREDERIVATER ELLER SALTE DERAF MED FARMACEUTISK ACCEPTABLESYRER

Trans-3-(4-oxo-4H-quinazolin-3-yl)-2-propenoic acid derivatives of the formula I wherein R1 is hydrogen, lower alkyl, lower cycloalkyl, lower alkoxy, hydroxy, halo, lower alkykthio, lower alkylsulfinyl, lower alkylsulfonyl, di-(C1-C7)alkyl-N(CH2)nO- or 2-hydroxyethoxy; R2 is hydrogen, lower alkyl or lower alkoxy; R3 is hydroxy, lower alkoxy, di-(C1-C7)alkyl-N(CH2)nO- or di-(C1-C7)alkyl-N(CH2)nNH-; and n is 2 to 7; provided that at least one of R1 and R2 is other than hydrogen, when R3 is hydroxy, a salt thereof with a pharmaceutically acceptable base, or when R3 is di-(C1-C7)alkyl-N(CH2)nO- or di-(C1-C7)alkyl-N(CH2)nNH-, a salt thereof with a pharmaceutically acceptable acid, and a process for the preparation thereof, are described. The compounds of formula I are useful as agents in the prevention of allergic reactions.