Patent ID: 8058307

Claim:
A compound of the formula or a salt thereof; in which R 1 is 7-oxabicyclo[2.2.1]heptanyl-; R 2 and R 3 are independently of one another hydrogen, C 1-6 alkyl, C 2-6 alkenyl or C 2-6 alkynyl, or the two radicals together with the carbon atom to which they are bonded are C 3-8 cycloalkyl; R 4 and R 5 are independently of one another hydrogen, C 1-6 alkyl, C 2-6 alkenyl or C 2-6 alkynyl or the two radicals together with the carbon atom to which they are bonded are C 3-8 cycloalkyl; R 6 is a group â€”CH 2 â€”R 7 , â€”CH 2 â€”COâ€”R 7 , â€”CH 2 â€”CH 2 â€”R 7 , â€”CH 2 â€”NR 8 â€”COâ€”R 7 , â€”CH 2 â€”COâ€”NR 8 â€”CH 2 â€”R 7 , â€”CH 2 â€”CH 2 â€”NR 8 â€”R 7 , â€”CH 2 â€”COâ€”NR 8 â€”R 7 or â€”COâ€”NR 8 â€”CH 2 â€”R 7 ; R 7 is optionally substituted phenyl, 2,3-dihydro-benzo[1,4]oxazinyl, 2,3-dihydro-benzo[1,4]thiazinyl or 1,2,3,4-tetrahydroquinolyl, wherein when R 7 is phenyl the optional substituents are selected from the group consisting of C 1-6 -alkyl, halogen, trifluoromethyl, C 1-4 -alkoxy-C 1-4 -alkyl, C 1-4 -alkoxy-C 1-4 -alkoxy-C 1-4 -alkyl, C 1-6 -alkoxy and C 1-4 -alkoxy-C 1-6 -alkoxy, and when R 7 is 2,3-dihydro-benzo[1,4]oxazinyl, 2,3-dihydro-benzo[1,4]thiazinyl or 1,2,3,4-tetrahydroquinolyl the optional substituents are selected from the group consisting of C 1-4 -alkoxycarbonylamino, C 1-4 -alkoxy-C 1-4 -alkoxy-C 1-4 -alkyl, C 1-4 -alkoxy-C 1-4 -alkyl, and Nâ€”C 1-4 -alkylcarbamoyl; and R 8 is hydrogen, C 1-6 alkyl or C 1-6 alkanoyl.