Preparation and characterization of two crystalline forms of 4-amino-5-chloro-2-methoxy-N-[(2S,4S)-1-ethyl-2-hydroxymethyl-4-pyrroli dinyl]benzamide (TKS159).
For 4-amino-5-chloro-2-methoxy-N-[(2S,4S)-1-ethyl-2-hydroxymethyl-4-pyrrolid inyl]benzamide (TKS159), two polymorphs, forms alpha and beta, were prepared and characterized by means of X-ray powder diffractometry, thermal analysis, infrared spectroscopy and 13C-NMR spectroscopy, both in the solution and solid phases. The X-ray powder diffraction analysis gave different patterns for forms alpha and beta. In the thermogravimetry and differential thermal analysis profiles, form beta exhibited characteristic endo- and exothermic peaks at 112.7 degrees C and 116.2 degrees C, respectively, due to the partial melting-induced phase transition to form alpha without accompanying weight loss, and these were followed by an additional endothermic peak at 138.2 degrees C due to fusion. For form alpha, only an endothermic peak at 137.8 degrees C due to fusion was observed. The IR spectroscopic analyses of forms alpha and beta gave different absorption bands assigned to N-H and O-H stretching, N-H bending, and C=O stretching vibrations. From the data obtained by thermal analysis, form alpha was shown to be thermodynamically more stable than form beta.
Yanagi
T
T
Research and Development Department, Teikoku Chemical Industries Co., Ltd., Itami, Hyogo, Japan.
Mizoguchi
J
J
Adachi
T
T
Sato
S
S
Kodama
K
K
Anzai
K
K
Takagishi
Y
Y
Kamei
C
C
Fujiwara
M
M
Matsushita
T
T
Yamashoji
Y
Y
Inoue
Y
Y
D001549:Benzamides / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004055:Differential Thermal Analysis; D005765:Gastrointestinal Agents / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D011759:Pyrrolidines / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013237:Stereoisomerism; D013818:Thermogravimetry
D001549:Benzamides; D005765:Gastrointestinal Agents; D011759:Pyrrolidines; C409522:TSK 159