Phthalimide → HCID 17796589, compound

Participants

Reaction Steps

In tetrahydrofuran (100 ml), 5-tert-butoxycarbonyl-2-hydroxymethyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine (WO94/21599) (2.10 g) was dissolved. After the addition of triphenylphosphine (2.66 g) and phthalimide (1.15 g), diethyl azodicarboxylate (1.28 ml) was added dropwise, followed by stirring at room temperature for 5 hours. The reaction mixture was concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column (hexane:ethyl acetate=4:1), whereby a colorless solid was obtained. The resulting solid was dissolved in ethanol (40 ml), followed by the addition of hydrazine hydrate (0.39 ml). The resulting mixture was heated under reflux for 5 hours. The precipitate was filtered off and the filtrate was concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column (dichloromethane˜dichloromethane:methanol=25:1), whereby the title compound (448 mg, 21%) was obtained.

Provenance & Evidence