| abstract |
Compounds of the formula (I> <IMAGE> wherein X represents a bond, C1-6 alkylene, C2-6 alkenylene or C2-6 alkynylene and Y represents a bond, C1-4 alkylene, C2-4 alkenylene or C2-4 alkynylene, the sum total of carbon atoms in X and Y being not more than 8; Ar represents a phenyl group substituted by one or more substituents selected from nitro, -(CH2)qR [where R is C1-3 alkoxy, -NR<3>R<4> (where R<3> and R<4> each represent a hydrogen atom, or a C1-4 alkyl group, or-NR<3>R<4> forms a saturated heterocyclic amino group which has 5-7 ring members), -NR<5>COR<6> (where R<5> represents a hydrogen atom or a C1-4alkyl group, and R<6> represents a hydrogen atom or a C1-4alkyl, C1-4alkoxy or-NR<3>R<4> group), and q is 1 to 3], -(CH2)rR<7> [where R<7> represents -NR<5>SO2R<8> (where R<8> represents a C1-4 alkyl, phenyl or -NR<3>R<4> group),- NR<5>COCH2N(R<5>)2 (where each of the groups R<5> represents a hydrogen atom or a C1-4 alkyl group), -COR<9 > (where R<9> represents hydroxy, C1-4 alkoxy or a NR<3>R<4>), -SR<10> (where R<10> is a hydrogen atom, or a C1-4 alkyl group optionally substituted by hydroxy, C1-4 alkoxy or NR<3>R<4>), -SOR<10>, -SO2R10, -CN, or -NR11R<12> (where R<11> and R<12> represent a hydrogen atom or a C1-4 alkyl group, at least one of which is C2-4 alkyl substituted by a hydroxy, C1-4 alkoxy or NR<3>R<4> group), and r is 0 to 3], -O(CH2)qCOR<9>, or -O(CH2)tR<13> [where R<13> represents hydroxy, NR<3>R<4>, NR<11>R<12> or a C1-4alkoxy group optionally substituted by hydroxy, C1-4 alkoxy or NR<3>R<4>,and t is 2 or 3]. R<1> and R<2> each represents a hydrogen atom or a C1-3 alkyl group, the sum total of carbon atoms in R<1> and R<2> being not more than 4; and physiologically acceptable salts and solvates (e.g. hydrates) thereof, have a stimulant action at a beta 2-adreno-receptors and may be used in the treatment of diseases associated with reversible airways obstruction such as asthma and chronic bronchitis. |