Patent ID: 8471010

Claim:
A process for preparing a compound of formula (I): comprising: (a) reacting a compound of formula (II) with urea, in the presence of acid, to yield an intermediate of formula IV and (b) cyclizing the compound of the formula (IV) with a base, to yield the compound of the formula I, wherein R 1 and R 2 are each independently H, alkyl, cycloalkyl, aryl, heteroaryl, heterocycloalkyl, halogen, alkoxy, aryloxy, cycloalkoxy, heteroaryloxy, heterocycloalkoxy, —NO 2 , —NRR′, haloalkyl, haloalkoxy, —SH, —S-alkyl, —SO 2 -alkyl, —SO 2 NH 2 , —SO 2 NH-alkyl, or —SO 2 N(alkyl) 2 ; wherein R and R′ are each independently H or alkyl; and wherein R a is H, halogen, alkyl, or aryl.