Patent ID: 8247433

Claim:
A process for preparing a compound of formula I: or a salt thereof, where: a is 0, 1, 2, 3, or 4; each R l is independently halo or trifluoromethyl; R 3 is hydrogen, halo, or —C 1-6 alkyl; R 4 , R 5 , and R 6 are independently hydrogen or halo; the process comprising the steps of: (a) reacting a compound of formula 1: or a salt thereof, with a compound of formula 2: in the presence of a base, to provide a compound of formula 3: or a salt thereof, where L is a leaving group and P is an amino-protecting group; and (b) removing the amino-protecting group, P, from the compound of formula 3 or a salt thereof, to provide a compound of formula I or a salt thereof.