2-Chloro-1-(4-methylpiperazin-1-yl)ethanone → 1'-({6-Chloro-1-[2-(4-methylpiperazin-1-yl)-2-oxoethyl]-1H-indol-3-yl}carbonyl)-5-fluoro-3H-spiro[2-benzofuran-1,4'-piperidin]-3-one

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Following the general procedure V as described hereinabove, the alkylation of 1′-[(6-chloro-1H-indol-3-yl)carbonyl]-5-fluoro-3H-spiro[2-benzofuran-1,4′-piperidin]-3-one (the preparation of which have been described in example 19) with commercially available 2-chloro-1-(4-methyl-piperazin-1-yl)-ethanone as electrophile, the title compound was obtained as a white solid. ES-MS m/e (%): 539.4 (M+H+).

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