| abstract |
A cyanofluoropyrrolidine compound of Formula (I) or a pharmaceutically acceptable salt thereof or a hydrate thereof, which is useful as an agent for preventing or treating diseases or conditions capable of being improved by inhibition of dipeptidyl peptidase IV (DPPIV), diabetes mellitus, immune diseases and the like: n n[wherein A represents a hydrogen atom or a fluorine atom, n R 1 and R 2 are as defined in the specification, X represents a single bond or a C 13 alkylene group, and R 3 represents a group represented by the formula: —N(R 4 )COR 5 , —N(R 4 )SO 2 R 5 , —NR 4 R 6 , —SO 2 R 5 , —SO 2 NR 4 R 5 , —OCONR 4 R 5 , —CH═CH—R 7 or —C≡C—R 7 , or represents a heteroaryl group selected from a heteroaryl group which contains at least one oxygen and/or sulfur atom and which may further contain a nitrogen atom, and a 6-membered nitrogen-containing aromatic ring or a 9- to 11-membered condensed ring thereof (wherein the heteroaryl group may be substituted with one or more substituents selected from the substituent Y 3 group)]. |