Water → 9-(3,4-Dimethoxy-benzyl)-2,3-dimethoxy-6,7,8,9-tetrahydro-5-thia-8-aza-benzocycloheptene

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Reaction Conditions

Reaction Steps

To a stirred solution of 2-(3,4-dimethoxy-phenyl)-N-[2-(3,4-dimethoxy-phenylsulfanyl)-ethyl]-acetamide (4.0 g, 10.0 mmol) in dry CH3CN (21 ml), was added POCl3 (2.80 ml, 30.0 mmol). The resulting mixture was stirred at reflux for 3 h under nitrogen. After cooling, the reaction mixture was concentrated in vacuo and the residue was dissolved in MeOH (85 ml). The solution was cooled to 0° C. and NaBH4 (2.7 g, 69.0 mmol) was added portionwise, the resulting pale yellow suspension was stirred at RT for 16 h under nitrogen. The reaction mixture was poured into H2O and extracted three times with CH2Cl2. The combined organic phases were dried over anhydrous MgSO4, filtered and concentrated to give a crude oil. Flash chromatography (CH2Cl2/MeOH: 9/1) gave the title product (1.14 g, 27%) as a viscous brown oil.

Provenance & Evidence