Patent ID: 7541475

Claim:
A process for the preparation of a compound of formula (IV) wherein R 1 is selected from the group consisting of heteroaryl, phenyl, or phenyl substituted with one, two, three, or four substituents independently selected from the group consisting of C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl, —OH, —F, —Cl, —Br, —I, —NH 2 and —NO 2 ; R 2 is selected from a group consisting of hydrogen, C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, and C 2 -C 6 -alkynyl; and R 3 is selected from a group consisting of hydrogen, C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, and C 2 -C 6 -alkynyl; the process comprising reacting a compound having formula (I) R 1 —(C═S)—NH 2 (I), with a compound having formula (V) wherein X is selected from the group consisting of —Cl, —Br, —I, and —F.