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US Patent 7232930 Compounds and methods for preparing methanesulfonamides

Patent 7232930 was granted and assigned to Pharmacia & Upjohn on June, 2007 by the United States Patent and Trademark Office.

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Patent abstract

A process for preparing (S)-(−)-N-[4-[4-[ethyl(6-fluoro-6-methylheptyl)amino]-1-hydroxy]phenyl]methanesulfonamide hemifumarate salt, which comprises reacting N-[4-[(2S)-tetrahydro-5-hydroxy-2-furanyl]phenyl]methanesulfonamide(IIa) with fluoroamine (III) in the presence of triacetoxyborohydride and ethyl acetate to provide [4-[-4-[ethyl(6-fluoro-6-methylheptyl)amino]-1-hydroxylphenyl]methanesulfonamide (I) and then converting I into the hemifumarate salt Ia. A process for preparing IIa is also claimed as well as intermediates IIa-IId.

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