Cetilistat crystal
A new technology of lixistat and crystals, which is applied in the field of crystals for the treatment of obesity, can solve the problems affecting the bioavailability and absorption of drugs, and the difference in clinical drug effects, and achieve easy control, difficult crystal transformation, and good stability Effect
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Embodiment 1
[0034] Take 300mg of Neolistat in a round-bottomed flask of appropriate volume, add 30mL of dichloromethane, stir and dissolve at 30°C, filter while hot to remove impurities, and spin-evaporate the obtained filtrate in a round-bottomed flask at a temperature of 40°C The obtained solid was dried in an oven to obtain 293 mg of Neolistat Crystal II with a yield of 97.7% and a purity of 99.6%.
[0035] After determination, the X-ray powder diffraction pattern of its obtained new lisstat crystal II is as follows: figure 1 As shown, where the 2θ angles are: 3.9±0.2°, 7.8±0.2°, 12.7±0.2°, 18.2±0.2°, 20.2±0.2°, 23.7±0.2°, 24.5±0.2°, 25.3±0.2° Characteristic peaks.
Embodiment 2
[0037] Take 500mg of Neolistat in a round-bottomed flask of appropriate volume, add 50mL of dichloromethane, stir and dissolve at 50°C, filter while hot to remove impurities, and spin-evaporate the obtained filtrate in a round-bottomed flask at a temperature of 42°C The obtained solid was dried in an oven to obtain 487 mg of Neolistat Crystal II with a yield of 97.4% and a purity of 99.9%. Its X-ray powder diffraction pattern data are with embodiment 1.
Embodiment 3
[0039] Take 400mg of Neolistat in a round-bottomed flask of appropriate volume, add 40mL of dichloromethane, stir and dissolve at 45°C, filter while hot to remove impurities, and spin-evaporate the obtained filtrate in a round-bottomed flask at a temperature of 43°C The obtained solid was dried in an oven to obtain 387 mg of Neolistat Crystal II with a yield of 96.8% and a purity of 99.9%. Its X-ray powder diffraction pattern data are with embodiment 1.
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