The invention relates to indole derivative having the general Formula Iwherein A represents a 5-membered aromatic heterocyclic ring, wherein X1, X2 and X3 are independently selected from N, O, S and CH; Y represents CH2, O, S or SO2; R1 is H, (C1-4)-
alkyl, (C1-4)alkyloxy, CN or
halogen; R2, R2′, R3, R3′, R4, R4′, R5 and R5′ are independently
hydrogen, (C1-4)
alkyl (optionally substituted with OH) or CO—OR8; or one pair of geminal substituents R3 and R3′ or R5 and R5′ together represent a keto group, and the others are all
hydrogen or (C1-4)
alkyl; or R2 and R5 together represent a
methylene or an
ethylene bridge, and R2′, R3, R3′, R4, R4′ and R5′ are
hydrogen; n is 1 or 2; R6 is H, (C1-4)alkyl (optionally substituted with OH, (C1-4)alkyloxy, CO—NR9R10, CO—OR11 or 1,2,4-oxadiazol-3-yl), SO2NR12R13 or COOR14; R7 is H or
halogen; R8 is (C1-4)alkyl; R9 and R10 are independently hydrogen, (C1-4)alkyl or (C3-7)cycloalkyl, the alkyl groups being optionally substituted with OH or (C1-4)alkyloxy; R11 is H or (C1-4)alkyl; R12 and R13 are independently H or (C1-4)alkyl; R14 is (C1-6)alkyl; or a pharmaceutically acceptable salt thereof, as agonists of the
cannabinoid CB1
receptor, which can be used in the treatment of pain such as for example peri-operative pain,
chronic pain,
neuropathic pain,
cancer pain and pain and
spasticity associated with
multiple sclerosis.