L-Malic Acid → (S)-Zopiclone L-Malate

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A reactor was charged with 5.67 g (S)-zopiclone and 194 g ethanol (SDA 3A). The mixture was heated to 65° C., and to the reactor was added a solution created by combining 2.05 g of L-malic acid with 18.5 g ethanol. The reaction was rinsed in with 26 g ethanol. The mixture was seeded with 100 mg powdered (S)-zopiclone-L-malate, and aged for 60 minutes. The mixture was cooled to 40° C. at 0.3° C./minute and aged for 30 mins. The mixture was cooled to 20° C. at 0.5° C./minute and aged for 30 mins. The mixture was filtered, washed with 20 g ethanol in one wash, dried in vacuo until no further weight loss at approximately 50° C. (˜6 h), to provide the titled compound in 86% yield.

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