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Concise Synthesis of Key Intermediates of Pyriftalid and Paquinimod via Hydrogenation Method

Posted on 2017-08-21 - 18:13
An efficient and scalable synthesis of 7-amino-3-methyl­isobenzofuran-1­(3H)-one (1) and 2-amino-6-ethylbenzoic acid (2) has been developed via a one-step catalytic hydrogenation. The triethylammonium salt of 2-acetyl-6-nitrobenzoic acid was used as the starting material and 1 was prepared in a biphasic solvent system of toluene/H2O, while 2 was obtained when the solvent was replaced with H2O. Intermediates 1 and 2 could be used to synthesize Pyriftalid and Paquinimod, respectively.

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