Fumaric Acid → (4-Isopropyl-piperazin-1-yl)-(4-morpholin-4-ylmethyl-phenyl)-methanone Mono-fumarate Salt

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To a THF solution (40 mL) of (4-isopropyl-piperazin-1-yl)-(4-morpholin-4-ylmethyl-phenyl)-methanone (3.0 g, 9.0 mmol) were added THF (40 mL) and fumaric acid (3.3 g, 28.4 mmol). The resulting mixture was heated to 60° C. and stirred for 0.5 h. The resulting suspension was cooled to 0° C. and the resulting precipitate was collected by filtration, washed with THF (20 mL), and dried in a vacuum oven at 65° C. for 20 h to yield crude title compound as a white solid.

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