Acetic Anhydride → 2-Acetylaminomethyl-7-benzyl-3-chloro-4-(3,4-dimethoxyphenyl)-5,6,7,8-tetrahydrothieno[2,3-b:5,4-c']dipyridine

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Reaction Steps

A mixture of the compound (0.3 g) obtained in Example 18B, acetic anhydride (0.142 g) and pyridine (2.5 ml) was stirred at room temperature for 1 hour and concentrated under reduced pressure. Ethyl acetate was added to the residue, which was washed with water, dried (MgSO4) and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography and eluted with ethyl acetate to yield 2-acetylaminomethyl-7-benzyl-3-chloro-4-(3,4-dimethoxyphenyl)-5,6,7,8-tetrahydrothieno[2,3-b:5,4-c']dipyridine as an oil, which was then treated with ethanolic hydrochloride to yield the hydrochloride which was recrystallized from dichloromethane-ethyl ether to yield light-yellow powder having a melting point of 172 to 174° C.

Provenance & Evidence