Sodium Carbonate → (7RS,9aSR)-7-hydroxymethyl-2-(pyrimidin-2-yl)-2,3,4,6,7,8,9,9a-octahydro-1H-pyrido[1,2-a]pyrazine

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A mixture of 4.5 g (26 mmol) of (7RS,9aSR)-7-hydroxymethyl-2,3,4,6,7,8,9,9a-octahydro-1H-pyrido[1,2-a]pyrazine (U.S. Pat. No. 5,326,874), 3.0 g (26 mmol) of 2-chloropyrimidine, and 6.7 g (63 mmol) of sodium carbonate in 100 mL of water is heated at 95° C. for 16 h. The mixture was cooled to room temperature, extracted with methylene chloride (3×), the combined organic layers were washed with water and brine, dried, filtered and evaporated to give 4.68 g (72%) of the title compound which was used without purification in subsequent reactions.

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