Crystals of n-(trans-4-isopropylcyclohexylcarbonyl)-...

C - Chemistry – Metallurgy – 07 – C

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C07C 233/63 (2006.01) A61K 31/195 (2006.01) C07C 231/22 (2006.01)

Patent

CA 2114678

Stable crystals of N-(trans-4-isopropylcyclo- hexylcarbonyl)-D-phenylalanine may be produced by treating this compound with a solvent at a temperature of at least 10°C and forming crystals in the solvent at a temperature of at least 10°C. For example, crystals may be formed by crystallization out of solution, or may be formed from solid particles of the compound suspended in a solvent. Crystals formed in this way have different melting points, infra red spectrum and X-ray diffraction patterns from previously known forms of the compound and have enhanced processability, e.g., stability to grinding.

Des cristaux stables de N-(trans-4-isopropylcyclohexylcarbonyl)-D-phénylalanine peuvent être produits par traitement de ce composé avec un solvant, à une température d'au moins 10 degrés C, et formation de cristaux dans le solvant à une température d'au moins 10 degrés C aussi. Par exemple, les cristaux peuvent être formés par cristallisation à partir de la solution, ou à partir de particules solides du composé en suspension dans un solvant. Les cristaux formés de cette façon présentent un point de fusion, un spectre infra-rouge et des caractéristiques de diffraction des rayons X, tous différents comparativement aux formes antérieures connues du composé; de plus, leur transformabilité se trouve améliorée, notamment leur stabilité au broyage.

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