Methanol → 4-{2-[2-(2-Methoxyphenoxy)ethylamino]-2-methylethyl}-2-(methylsulfinyl)anisole

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Reaction Steps

In 100 ml of a mixture of methanol and water (5:1) was dissolved 1.8 g of 4-{2-[2-(2-methoxyphenoxy)ethylamino]-2-methylethyl}-2-(methylthio)anisole and after adding dropwise thereto 10.5 ml of an aqueous solution of 0.5M sodium metaperoiodate at 0° C., the mixture was stirred overnight at 4° C. The crystals formed were removed by filtratation and the filtrate was concentrated under reduced pressure and the residue formed was purified by a silica gel column chromatography (eluate: a mixture of chloroform and methanol (97:3 by volume ratio) to provide 722 mg of oily 4-{2-[2-(2-methoxyphenoxy)ethylamino]-2-methylethyl}-2-(methylsulfinyl)anisole. The product was dissolved in 10 ml of methanol and after adding thereto a solution of 252 mg of oxalic acid di-hydrate dissolved in 6 ml of methanol, the mixture was allowed to stand overnight at room temperature. The resulting crystalline material was recovered by filtration and recrystallized from ethanol to provide 700 mg of 4-{2-[2-(2-methoxyphenoxy)ethylamino]-2-methylethyl}-2-(methylsulfinyl)anisole oxalate having a melting point of 172°-174° C. The product has the following physicochemical properties:

Provenance & Evidence