Imatinib → N-(4-Methyl-3-nitro-phenyl)-4-(4-methyl-piperazin-1-ylmethyl)-benzamide

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Reaction Steps

U.S. Pat. No. 5,521,184 and application WO 03/066613 describe several synthetic routes for preparing Imatinib. One synthetic process, described in Scheme 1, comprises reacting 4-(4-methyl-piperazin-1-ylmethyl)-benzoic acid methyl ester with 3-nitro-4-methyl-aniline to obtain N-(4-methyl-3-nitrophenyl)-4-(4-methyl-piperazin-1-ylmethyl)-benzamide, which is subsequently reduced to obtain N-(3-amino-4-methyl-phenyl)-4-(4-methyl-piperazin-1-ylmethyl)-benzamide. The latter is reacted with cyanamide (NH2CN) in a mixture of concentrated hydrochloric acid solution and n-butanol to produce N-(3-guanidino-4-methyl-phenyl)-4-(4-methyl-piperazin-1-ylmethyl)-benzamide, which is subsequently reacted with 3-dimethylamino-1-pyridin-3-yl-propenone to obtain Imatinib.

Provenance & Evidence