Cesium carbonate → methyl 4-(3,4,6,7,8,8a-hexahydro-1H-pyrrolo[2,1-c]pyrazin-2-yl)benzoate

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Methyl 4-iodobenzoate (2.076 g, 7.92 mmol), cesium carbonate (5.16 g, 15.85 mmol), 2-acetylcyclohexanone (0.209 mL, 1.58 mmol) and copper(I) iodide (0.075 g, 0.40 mmol) were added to a stirred solution of 1,2,3,4,6,7,8,8a-octahydropyrrolo[1,2-a]pyrazine (1 g, 7.92 mmol) in DMF (20 mL) under nitrogen. The resulting suspension was stirred at 90° C. for 20 h. The reaction mixture was evaporated to dryness and redissolved in a mixture of methanol and water. The crude product was purified by ion exchange chromatography, using a SCX column. The desired product was eluted from the column using 3.5M NH3/MeOH and pure fractions were evaporated to dryness to afford methyl 4-(3,4,6,7,8,8a-hexahydro-1H-pyrrolo[2,1-c]pyrazin-2-yl)benzoate (1.243 g, 60.2%) as a brown gum.

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