| abstract |
A process for the preparation of intermediate compounds useful in the preparation of octahydropyrazolo (3,4-g) quinolines of formula **(Formula-01)** where R is alkyl or benzyl and R1 is COOZ'', where Z'' is C1-C2 alkyl or phenyl-C1-C2 alkyl, whose process is characterized by reacting a compound of formula **(Formula-02)** where R and Z'' are as defined above and Z is C1-C3 alkyl , C2-C3 alkenyl, C2-C3 alkynyl, C5-C6 cycloalkyl, phenyl or substituted phenyl, by hydrolysis to form a 6-hydroxy-3-carboxylic acid, followed by re-esterification with an alcohol in the presence of an acid. |