Patent ID: 7956212

Claim:
A method of synthesizing a compound of Formula (II): a stereoisomer thereof, an enantiomer thereof, or a pharmaceutically acceptable salt thereof, comprising: reacting a compound of Formula (2a) wherein P 1 is an amino protecting group; with a halide of Formula (3): in the presence of a base; and removing P 1 to provide the compound of Formula (II), wherein: X′ is halogen; n is an integer from 2 to 4; each R 1 is independently selected from hydrogen, a straight chain C 1-3 alkyl, and a branched C 1-3 alkyl; each R 2 is hydrogen; and R 5 is selected from phenyl and substituted phenyl wherein one or more of the substituent groups is selected from halo, —OH, C 1-6 alkyl, and C 1-6 alkoxy.