Compounds of formula (I) are active as dopaminergic compounds or as compounds which or as compounds which diminish the symptoms of dopamine deficiency: wherein: R
1
and R
2
are independently selected from —C(═O)R
5
or —C(═O)OR
5
; or one of R
1
and R
2
is hydrogen and the other is —C(═O)R
5
or —C(═O)OR
5
; R
3
and R
4
are independently selected from hydrogen, optionally substituted C
1
-C
6
alkyl, C
3
-C
6
cycloalkyl, C
2
-C
6
alkenyl, or C
2
-C
6
alkynyl, —CH2Q, —C(═O)R
5
, —C(═O)OR
5
, —C(═O)NR
5
R
6
, or R
5
is hydrogen or optionally substituted C
1
-C
6
alkyl or —CH
2
Q; R
6
is hydrogen or optionally substituted C
1
-C
6
alkyl Or —CH
2
Q; and Q is an optionally substituted monocyclic carbocyclic or heterocyclyl ring of 3 to 6 ring atoms.
式(I)的化合物具有作为
多巴胺能化合物的活性,或作为减轻
多巴胺缺乏症状的化合物,其中:R1和R2独立地选自—C(═O)R5或—C(═O)OR5;或者R1和R2中的一个是氢,另一个是—C(═O)R5或—C(═O)OR5;R3和R4独立地选自氢,可选取代的C1-C6烷基,C3-C6环烷基,C2-C6烯基或C2-C6炔基,—CH2Q,—C(═O)R5,—C(═O)OR5,—C(═O)NR5R6,其中R5是氢或可选取代的C1-C6烷基或—CH2Q;R6是氢或可选取代的C1-C6烷基或—CH2Q;Q是具有3至6个环原子的可选取代的单环碳环或杂环基。