NEW CATHEPSIN S PROTEASE INHIBITORS, USEFUL IN THE TREATMENT OF E.G. AUTOIMMUNE DISORDERS, ALLERGY AND CHRONIC PAIN CONDITIONS

摘要

There is provided a process for the preparation of a compound of formula III, comprising the step of oxidising the compound of formula 2b wherein n is 2; R 2a and R 2b are independently H or F; R 3 is 1-methylcyclopentylmethyl or 1-fluorocyclopentylmethyl; R 3' is CH 3 or F; R 4 is C 1 -C 6 alkyl, C 1 -C 6 haloalkyl or C 3 -C 6 cycloalkyl, wherein C 3 -C 6 cycloalkyl is optionally substituted with methyl, CF 3 or one or two fluoro. Compounds and processes used in the preparation of a compound of formula III are also provided.