Patent ID: 6252072
Filing Date: 2001-06-26
Classification: C07D

Abstract:
A process for the preparation of a compound of formula I ##STR25##whereinR.sub.1 is selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl;R.sub.2 is selected from the group consisting of hydrogen, C.sub.1 -C.sub.3 alkyl, and cyclopropyl;A is selected from the group consisting of 2-chloropyrid-5-yl, tetrahydrofuran-3-yl, 5-methyl-tetraqhydrofuran-3-yl, and chlorothiazolyl;by hydrolysis of a compound of formula II ##STR26##wherein R.sub.1, R.sub.2, and A have the same meanings as above in formula (I), andR.sub.3 is selected from the group consisting of C.sub.1 -C.sub.3 alkyl, cyclopropyl, cyclohexyl, phenyl, and benzyl;wherein said hydrolysis is carried out at a pH of between 7 and 14.