Oxatomide → ethyl 3-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-2,3-dihydro-2-oxo-1H-benzimidazole-1-acetate

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To a stirred mixture of 9.4 parts of 1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1,3-dihydro-2H-benzimidazol-2-one and 180 parts of methylbenzene are added 0.8 parts of sodium hydride dispersion 75% and the whole is stirred and heated for 60 minutes at 90° C. After cooling to 30° C., 0.2 parts of 2,3,11,12-dibenzo-1,4,7,10,13,16-hexaoxacyclooctadeca-2,11-diene are added and stirring is continued for 10 minutes. Then there are added 4.2 parts of ethyl 2-bromoacetate and the mixture is stirred and refluxed overnight. The reaction mixture is cooled to 90° C., 50 parts of water are added and the layers are separated while hot. The organic phase is evaporated, yielding 10 parts of ethyl 3-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-2,3-dihydro-2-oxo-1H-benzimidazole-1-acetate as a residue.

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