| 摘要 |
The invention relates to a compound of formula (I) or a salt thereof: wherein: R<SUP>1 </SUP>is C<SUB>1-4</SUB>alkyl, C<SUB>1-3</SUB>fluoroalkyl, -CH<SUB>2</SUB>CH<SUB>2</SUB>OH or -CH<SUB>2</SUB>CH<SUB>2</SUB>CO<SUB>2</SUB>C<SUB>1-2</SUB>alkyl; R<SUP>2 </SUP>is a hydrogen atom (H), methyl or C<SUB>1</SUB>fluoroalkyl; R<SUP>3 </SUP>is optionally substituted C<SUB>3-8</SUB>cycloalkyl or optionally substituted mono-unsaturated-C<SUB>5-7</SUB>cycloalkenyl or an optionally substituted heterocyclic group of sub-formula (aa), (bb) or (cc); in which n<SUP>1 </SUP>and n<SUP>2 </SUP>independently are 1 or 2; and in which Y is O, S, SO<SUB>2</SUB>, or NR<SUP>10</SUP>; or R<SUP>3 </SUP>is a bicyclic group (dd) or (ee): and wherein X is NR<SUP>4</SUP>R<SUP>5 </SUP>or OR<SUP>5a</SUP>. The compounds are phosphodiesterase (PDE) inhibitors, in particular PDE 4 inhibitors. Also provided is the use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for the treatment and/or prophylaxis of an inflammatory and/or allergic disease in a mammal such as a human, for example chronic obstructive pulmonary disease (COPD), asthma, or allergic rhinitis.
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