Methyl 4,5-dimethoxyanthranilate → N-(4-chloro-3-methyl-5-isoxazolyl)-2-[(4,5-dimethoxy-2-methoxycarbonylphenyl)aminocarbonyl]thiophene-3-sulfonamide

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The title compounds were prepared by the method set forth for N-(4-chloro-3-methyl-5-isoxazolyl)2-{[2-acetyl-4,5-(methylenedioxy)phenyl]aminocarbonyl}thiophene-3-sulfonamide (EXAMPLE 148) except that methyl-2-amino-4,5-dimethoxybenzoate was used instead of 2'-amino-4',5=-(methylenedioxy)acetophenone. The crude product was purified via HPLC to give N-(4-chloro-3-methyl-5-isoxazolyl)-2-[(4,5-dimethoxy-2-methoxycarbonylphenyl)aminocarbonyl]thiophene-3-sulfonamide as a yellow powder (13% yield, m.p. 167-168° C.) and N-(4-chloro-3-methyl-5-isoxazolyl)-2-{{2-[(4,5-dimethoxy-2-methoxycarbonyl)phenylaminocarbonyl]-4,5-dimethoxy}phenylaminocarbonyl}thiophene-3-sulfonamide as a dull yellow solid (1% yield, m.p. 228-230° C.).

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