PHENETHANOLAMINE DERIVATIVES

摘要

Phenethanolamine derivatives are disclosed of formula wherein m is 2 to 8; n is 1 to 7 provided that m+n is 4 to 12; Ar is phenyl or phenyl substituted by one or two halogen atoms, alkyl or alkoxy groups or by an alkylenedioxy group; R1 and R2 are hydrogen or alkyl provided that the sum total of carbon atoms in R1 and R2 is not more than 4; and the physiologically acceptable salts and solvates thereof. The compounds have a selective stimulant action at .beta.2-adrenoreceptors and may be used inter alia in the treatment of diseases associated with reversible airways obstructions such as asthma and chronic bronchitis. The compounds may be formulated in conventional manner as pharmaceutical compositions with physiologically acceptable carriers or excipients. The compounds may be prepared, for example by alkylation of an amine: where R3, R5 and R6 is hydrogen or a protecting group, followed by removal of any protecting group.