Dimethylformamide dimethyl acetal → 1-Cyclohexyl-7-{[2-(trimethylsilyl)ethoxy]methyl}-1,4-di hydropyrrolo[3',2': 5,6]pyrido[3,4-b][1,4]thiazine-4,4(7H)-dione

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Reaction Steps

N-Cyclohexyl-5-(methylsulfonyl)-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-pyrrolo[2,3-b]pyridin-4-amine (6.1 mg, 0.014 mmol) in N,N-dimethylformamide dimethyl acetal (2.5 mL) was stirred at 170° C. for 3 hours under microwave irradiation. The reaction mixture was allowed to cool to room temperature and concentrated under reduced pressure. The resulting residue was dissolved in tetrahydrofuran (1 mL) and stirred with 1 M hydrochloric acid (1 mL) at 80° C. for 1 hour. The reaction mixture was allowed to cool to room temperature and, after addition of water, extracted with ethyl acetate, and the organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The resulting pale yellow oil (8.5 mg) containing the title compound was used for the next step without further purification.

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