| abstract |
A class of diaryldiamine derivatives of formula (I) in which R1 and R2, are each hydrogen, alkyl, cycloalkyl, cycloalkenyl, cycloalkylalkyl, alkenyl, alkynyl, aryl, aralkyl or furan-2 or 3-yl alkyl or may form together a C3-7 alkyl ring which may be interrupted by an oxygen; R3 and R4, are each hydrogen, alkyl, or R4 is oxygen forming with the carbon atom to which is attached a C=O group; R5 is hydrogen, hydroxy, alkoxy, thiol or alkylthio; R6 is phenyl, halogen, NH2 or a para or meta -C(Z)-R8 group, in which Z is oxygen or sulphur; R8 is alkyl, alkoxy or NR9R10, wherein R9 and R10 are hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, alkenyl, aryl, aralkyl, or R6 is a para or meta (a) group in which R11 and R12 are hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, alkenyl, aryl, aralkyl or an optionally substituted heterocyclic ring, and Z is as defined above; and, R7 is hydrogen, alkyl, or halogen are potent and selective delta opioid agonists and antagonists, and are of use as analgesics and for treating pathological conditions which, customarily, can be treated with agonists and antagonists of the delta opioid receptor. |