AN IMPROVED PROCESS FOR THE PREPARATION OF PURE PALONOSETRON HYDROCHLORIDE

摘要

The present invention relates to an improved and industrially viable process for the preparation of high purity >99.8% chemical and >99.8% chiral of palonosetron hydrochloride of formula-I ((3as)-2[(3s)-1-azabicyclo [2.2.2] oct-3-yl]-2,3,3a,4,5,6-hexahydro-1H-benz[de]isoquinoline-1-one monohydrochloride) obtained from reduction of 2-[(S)-1-azabicyclo[2.2.2]oct-3-yl]-2,4,5,6-tetrahydro-1H-benz[de]iso-quinolin-1-one hydrochloride of formula-VI. In the prior art compound of formula-VI or its base are used in the catalytic hydrogenation. But the selection of solvents like acetic acid or THF rendered them commercially not viable due to low yield and low purity of palonosetron hydrochloride. In the present process simple solvent like methanol and readily available palladium-on-carbon were used to increase the yield and purity of palonosetron hydrochloride. Palonosetron Hydrochloride is useful as anti-emetic agent during the chemotherapy of treatment of cancer patients and is marketed under the brand names 'Aloxi' and 'Onicit'.