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Example 5 Preparation of 5- [2- [4- (1, 2- benzisothiazol-3-yl) -1-piperazinyl] ethyl] -6-chloro-1, 3-dihydro-2H-indol-2-one (Ziprasidone base) Example 2 was repeated with the exception that 10 ml of 1-butyl-3-methylimidazolium bromide was used instead of 8 ml of 1-ethyl-3-methylimidazolium methyl sulfate. After the completion of the reaction the presence of 5- [2- [4- (1, 2- benzisothiazol-3-yl) -1-piperazinyl] ethyl] -6-chloro-1, 3- dihydro-2H-indol-2-one was confirmed by HPLC.
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Reference:
Patent; KRKA; EP1889844; (2008); A2;,
Indoline – Wikipedia,
Indoline | C8H9N – PubChem