| abstract |
The invention provides compounds of the general formula (I) <CHEM> and physiologically acceptable salts and solvates thereof, wherein Q represents a chlorine atom or a trifluoromethyl group; X represents a bond, or a C1-6alkylene, C2-6alkenylene or C2-6alkynylene chain, and Y represents a bond, or a C1-6alkylene, C2-6alkenylene or C2-6alkynylene chain with the proviso that the sum total or carbon atoms in the chains X and Y is not more than 10, and the chains XCH2 and CH2Y may each be optionally substituted by one or two C1-3alkyl groups, or, when one carbon atom is substituted by two alkyl groups, these may be linked to form an alkylene group; R represents a hydrogen atom or a C1-3alkyl group; R<1> and R<2> each represent a hydrogen atom or a C1-3alkyl group, with the proviso that the sum total of carbon atoms in R<1> and R<2> is not more than 4; and Het represents a benzoheteroaryl or a monocyclic heteroaryl group wherein the heteroaryl group is 5 or 6 membered and contains 1, 2 or 3 hetero atoms, one of which is a nitrogen atom and the other(s) is (are) nitrogen, oxygen or sulphur atom(s), and the group Het may optionally be substituted by one or two groups selected from C1-4alkyl, C1-4alkoxy, hydroxy, halogen, -NR<3>R<4> and -COR<8>; where R<3> and R<4> each represent a hydrogen atom or a C1-4alkyl group or -NR<3>R<4> forms a saturated heterocyclic amino group which has 5-7 ring members and optionally contains in the ring one or more atoms selected from -O- or -S- or a group -NH- or -N(CH3)-; and R<8> represents hydroxy, C1-4alkoxy or -NR<3>R<4>; with the proviso that (i) when Het represents a pyridyl group substituted by the group -NR<3>R<4> or -COR<8> and Q is a chlorine atom, or (ii) when Het represents a pyridyl group optionally substituted by one or two groups selected from halogen, hydroxy, C1-3alkyl and C1-3alkoxy, and Y represents a bond or a C1-4alkylene, C2-4alkenylene or C2-4alkynylene chain, then, in both cases, R represents a C1-3alkyl group and/or at least one of the chains -XCH2- and -CH2Y- is substituted by one or two C1-3alkyl groups. The compounds have a stimulant action at beta 2-adrenoreceptors and may be used in the treatment of diseases associated with reversible airways obstruction such as asthma and chronic bronchitis. |