Patent ID: 7009073

Claim:
A process for the preparation of compounds having the formula wherein R 1 and R 2 are selected independently from hydrogen, C 1 –C 5 alkyl, C 1 –C 5 alkoxy, trifluoromethyl, halogen, sulfonyl alkyl, alkylamino, amide, ester, aryl-alkyl, heteroalkyl, and arylalkoxy comprising hydrolyzing a compound of formula in the presence of an acid or base catalyst wherein R 1 and R 2 are selected independently from hydrogen, C 1 –C 5 alkyl, C 1 –C 5 alkoxy, trifluoromethyl, halogen, sulfonyl alkyl, alkylamino, amide, ester, aryl-alkyl, heteroalkyl, and arylalkoxy.