发明名称 |
Process for the isolation of high purity crystalline citalopram base |
摘要 |
A method is provided for the isolation of high purity crystalline citalopram (1-[3-dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofurancarbonitrile) base directly from the alkylation reaction mixture of 5-cyanophthalane with N,N-dimethylaminopropylchloride in a polar aprotic solvent using a strong base. The method comprises: (a) diluting the reaction mixture with ice cold water and extracting the resulting mixture with a water-immiscible organic solvent; (b) re-extracting the water-immiscible organic solvent extract with an aqueous acid; (c) diluting the aqueous acid extract with a substantially equal volume of a water miscible organic solvent, based on the volume of water in the aqueous acid extract; (d) adjusting the pH to basic with an inorganic base to precipitate free crystalline base, and (e) further isolating the precipitated free crystalline base by filtration.
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申请公布号 |
US2005217562(A1) |
申请公布日期 |
2005.10.06 |
申请号 |
US20050508529 |
申请日期 |
2005.06.10 |
申请人 |
JUBILANT ORGANOSYS LIMITED |
发明人 |
GOUD VUDDAMARI S.;GAONKAR SANTOSH L.;THOMAS SAJI;MANJUNATHA SULUR G.;KULKARNI ASHOK K.;BABU AMBATI N. |
分类号 |
C07D307/87;(IPC1-7):C30B23/00;C30B25/00;C30B28/12;C30B28/14 |
主分类号 |
C07D307/87 |
代理机构 |
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