| abstract |
Compounds of general formula (I) wherein each of R?1 and R2¿ independently represents a C¿1-6? alkyl or C2-7 acyl group; R?5¿ represents a hydrogen atom or a C¿1-3? alkyl, C2-3 alkenyl or C2-3 alkynyl group; R?6¿ represents a hydrogen atom or a C¿1-6? alkyl, C2-6 alkenyl, C2-6 alkynyl, amino, C1-6 alkylamino, di(C1-6) alkylamino or C2-7 acylamino group; each of R?7 and R8¿ independently represents a hydrogen or halogen atom or a hydroxy, trifluoromethyl, C¿1-6? alkyl, C2-6 alkenyl, C2-6 alkynyl, C2-7 acyl, C1-6 alkythio, C1-6 alkoxy, C3-6 cycloalkyl; and R?9¿ represents a hydrogen or halogen atom or a hydroxy, trifluoromethyl, C¿1-6? alkyl, C2-6 alkenyl, C2-6 alkynyl, C2-7 acyl, C1-6 alkythio, C1-6 alkoxy or C3-6 cycloalkyl group; X represents OCH2 or a group CR?3R4¿, wherein each of R?3 and R4¿ independently represents a hydrogen atom or a C¿1-3? alkyl group; each of R?10 and R11¿ independently represents a hydrogen atom, a C¿1-3? alkyl, C3-6 cycloalkyl or phenyl group; y represents an oxygen atom or a group CHNO2, NCN, NH or NNO2, n is an integer from 2 to 4; or a salt thereof; are useful for treatment of respiratory disorders such as asthma. Compounds of the invention have a longer duration of action than the known compound trequinsin (9, 10-dimethoxy-3-methyl-2-mesitylimino-2,3,6,7-tetrahydro-4H-pyrimido[6,1-a]isoquinolin-4-one) and do not have trequinsin's very bitter taste. |