| abstract |
Methods and materials for preparing an optically active compound of Formula (1), or a pharmaceutically acceptable salt thereof, or an opposite enantiomer of the compound of Formula (1) or pharmaceutically acceptable salt thereof, are disclosed. The method includes reducing a cyano moiety of a compound of Formula (5), or an opposite enantiomer thereof, or a salt of the compound of Formula (5) or opposite enantiomer thereof, to an amino moiety, wherein R1, R2, and R5 are defined in the specification. |