| 摘要 |
A compound having the formula I wherein: R1 is hydrogen or alkyl; R2 is hydrogen, alkyl, cyclohexylmethyl or -(CH2)mAr; Ar is phenyl, naphthyl, thienyl, furanyl or pyridinyl, each optionally substituted by one or two substituents selected independently from alkyl, halogen, alkoxy and trifluoromethyl; or NRlR2 is 1, 2, 3, 4-tetrahydroquinolin-1-yl or 1, 2, 3, 4-tetrahydroisoquinolin-2-yl; m is 1-5; n is 1 or 2; R3 is hydrogen or alkyl; Y is hydrogen, halogen, alkyl or alkoxy. These compounds are useful in treating diseases that respond to a dopamine D2 agonist.
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