Cesium carbonate → Formate

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A mixture of trans-8-chloro-1-[4-(3-fluoro-pyridin-2-yl)-cyclohexyl]-5,6-dihydro-4H-2,3,5,10b-tetraaza-benzo[e]azulene (50.0 mg, 0.126 mmol), cesium carbonate (246 mg, 0.754 mmol) and 2-methylaminoethyl chloride hydrochloride (65.4 mg, 0.503 mmol) in acetonitrile (1.3 ml) was heated at 70° C. for 20 h. After addition of further portions of cesium carbonate (246 mg, 0.754 mmol) and 2-methylaminoethyl chloride hydrochloride (65.4 mg, 0.503 mmol) the mixture was heated at 70° C. for another 20 h. The reaction mixture was partitioned between 1 M aqueous sodium hydroxide solution (2 ml) and ethyl acetate (5 ml). The layers were separated. The aqueous layer was extracted with two 5-ml portions of ethyl acetate. The combined organic layers were concentrated in vacuo. Preparative RP-HPLC with water (0.05% formic acid)/methanol as eluent gave the title compound as formate salt. The salt was partitioned between ethyl acetate (15 ml) and 1 M aqueous sodium hydroxide solution (10 ml). The layers were separated. The aqueous layer was extracted with two 15 ml-portions of ethyl acetate. The combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo to give the title compound (14 mg, 25%) as off-white solid. MS m/e: 455 ([M+H]+)

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