Patent ID: 8501954

Claim:
A process for the preparation of a compound of formula 4, or a tautomer, stereoisomer or pharmaceutically acceptable salt thereof: comprising reacting a compound of formula 5: with a compound of formula 6 wherein A is S; Z is selected from the group consisting of a halogen, OR 6 and SR 6 ; R 3 and R 4 are each independently selected from the group consisting of hydrogen, (C 1 -C 8 )alkyl, (C 2 -C 8 )alkenyl, (C 2 -C 8 )alkynyl, (C 1 -C 4 )alkoxy(C 1 -C 4 )alkyl, (C 1 -C 8 )fluoroalkyl, (C 1 -C 8 )hydroxyalkyl, (C 3 -C 8 )cycloalkyl, (C 3 -C 8 )aminoalkyl, (C 3 -C 8 )haloalkyl, (C 3 -C 8 )heteroalkyl, (C 3 -C 8 ) heterocycloalkyl, heteroaryl, aryl, (C 3 -C 8 )cycloalkyl(C 1 -C 6 )alkyl, (C 3 -C 8 )heterocycloalkyl(C 1 -C 6 )alkyl, and aryl(C 1 -C 6 )alkyl; wherein R 3 and R 4 are not simultaneously hydrogen; R 5 is selected from the group consisting of hydrogen, (C 1 -C 8 )alkyl, (C 2 -C 8 )alkenyl, (C 2 -C 8 )alkynyl, (C 1 -C 4 )alkoxy, (C 1 -C 4 )alkoxy(C 1 -C 4 )alkyl, (C 1 -C 8 )fluoroalkyl, (C 1 -C 8 )hydroxyalkyl, (C 3 -C 8 )cycloalkyl, (C 3 -C 8 )heterocycloalkyl, heteroaryl, aryl, (C 3 -C 8 )cycloalkyl(C 1 -C 6 )alkyl, (C 3 -C 8 )heterocycloalkyl(C 1 -C 6 )alkyl, heteroaryl(C 1 -C 6 )alkyl and aryl(C 1 -C 6 )alkyl; R 6 is selected from the group consisting of hydrogen, (C 1 -C 8 )alkyl, pentafluorophenyl, nitrophenyl, di-nitrophenyl, CF 3 phenyl, p-toluenesulfonyl, and methanesulfonyl; R m is selected from the group consisting of hydrogen, (C 1 -C 8 )alkyl, (C 2 -C 8 )alkenyl, (C 2 -C 8 )alkynyl, (C 1 -C 4 )alkoxy, (C 1 -C 4 )alkoxy(C 1 -C 4 )alkyl, (C 1 -C 8 )fluoroalkyl, (C 1 -C 8 )hydroxyalkyl, (C 3 -C 8 )cycloalkyl, (C 4 -C 8 )bicycloalkyl, (C 3 -C 8 )heterocycloalkyl, heteroaryl, aryl, (C 3 -C 8 )cycloalkyl(C 1 -C 6 )alkyl, (C 3 -C 8 )heterocycloalkyl(C 1 -C 6 )alkyl, heteroaryl(C 1 -C 6 )alkyl and aryl(C 1 -C 6 )alkyl; and R n is selected from the group consisting of (C 1 -C 8 )alkyl, (C 2 -C 8 )alkenyl, (C 2 -C 8 )alkynyl, (C 1 -C 4 )alkoxy, (C 1 -C 4 )alkoxy(C 1 -C 4 )alkyl, (C 1 -C 8 )fluoroalkyl, (C 1 -C 8 )hydroxyalkyl, (C 3 -C 8 )cycloalkyl, (C 4 -C 8 )bicycloalkyl, (C 3 -C 8 )heterocycloalkyl, heteroaryl, aryl, (C 3 -C 8 )cycloalkyl(C 1 -C 6 )alkyl, (C 3 -C 8 )heterocycloalkyl(C 1 -C 6 )alkyl, heteroaryl(C 1 -C 6 )alkyl and aryl(C 1 -C 6 )alkyl.