摘要:
The present invention provides a process for the preparation of crude 1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofuran carbonitrile base with substantially low levels of impurities by arresting the formation of substantial amount of carboxamide impurity, high molecular weight impurities and suppressing the formation of desmethylcitalopram besides taking the cyanide exchange reaction to near completion and thus avoiding an extensive and expensive purification process.
摘要:
The present invention relates to an improved process for preparing morphinane analogues of formula (1) wherein the substituents R1, R2, R2a, R3, R4, R5 and Y have the meanings as defined in the specifications.
摘要:
The present invention provides a process for decreasing the content of [1-(3-dimethylamino)propyl)]-1-(4-fluorophenyl)-1,3-dihydro-5-halo-isobenzofuran, a compound of formula 1, wherein X is halogen, by converting to a compound of formula 3, comprising subjecting [1-(3-dimethylamino)propyl)]-1-(4-fluorophenyl)-1,3-dihydro-5-halo-isobenzofuran present as impurity in crude 1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofuran carbonitrile to hydrogenolysis.
摘要:
The present invention relates to an improved process for preparing morphinane analogues of formula (1) wherein the substituents R1, R2, R3, R4, R5 and Y have the same meanings as defined in the specification.