Dronedarone → (5-Amino-2-butylbenzofuran-3-yl)(4-(3-(dibutylamino)propoxy)phenyl)methanone

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A process for the preparation of dronedarone was reported in the above said patent EP 0 471 609, according to which process 2-(n-butyl)-3-(4-{3-[di(n-butyl)amino]propoxy}benzoyl)-5-nitrobenzofuran is reduced under pressure with hydrogen in the presence of platinum oxide as catalyst to form 2-(n-butyl)-3-(4-{3-[di(n-butyl)amino]propoxy}benzoyl)-5-aminobenzofuran (hereinafter Compound A), which is subsequently treated with methanesulfonyl chloride, in the presence of an acid acceptor, to give the desired compound. According to this process, dronedarone could be obtained with an overall yield of the order of 60%, starting from the 5-nitrobenzofuran derivative.

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