| abstract |
The present invention relates to a new process for preparing Entacapone substantially free of Z-isomer from 3, 4-dihydroxy-5-Nitrobenzaldehyde and N, N-Dimethylcyano acetamide, or directly from a mixture of (E) - and (Z) - isomers of Entacapone, by formation of organic or inorganic salts, specially piperidine and sodium ones. A new crystalline form G of Entacapone can be obtained from this method in a fast, efficient, and simple way and substantially free of Z-isomer. Another object of the invention is a pharmaceutical composition comprising it. |