Treatments for restless legs syndrome

A method for treating restless legs syndrome (RLS) in a patient suffering from RLS, comprising the administration of an effective amount of a compound of formula I

• or a pharmaceutically acceptable salt thereof, wherein:
• R1, R2, and R3 are independently
• a) hydrogen,
• b) C1-6 alkyl, C3-5 alkenyl, or C3-5 alkynyl,
• c) C3-7 cycloalkyl, C4-10 cycloalkyl- or phenyl-substituted C1-6 alkyl, or
• d) R1 and R2 are joined to form a C3-7 cyclic amine which can contain additional heteroatoms and/or unsaturation;
• X is
• a) hydrogen,
• b) C1-6 alkyl
• c) halogen,
• d) hydroxy,
• e) alkoxy,
• f) cyano,
• g) carboxamide,
• h) carboxyl, or
• i) carboalkoxyl;
• A is
• a) CH, CH2, CH-halogen, CHCH3, C═O, C═S, C—SCH3, C═NH, C—NH2, C—NHCH3, C—NHCOOCH3, or C—NHCN;
• b) SO2, or
• c) N;
• B is
• a) CH2, CH, CH-halogen, or C═O, or
• b) N, NH or N—CH3;
• c) O
• n is 0 or 1;
• and
• D is
• a) CH, CH2, CH-halogen or C═O,
• b) O,
• c) N, NH or N—CH3.