Enantiotropically-related polymorphs of {4-(4-chloro-3-fluorophenyl)-2-[4-(methyloxy)phenyl]-1,3-thiazol-5-yl} acetic acid: crystal structures and multinuclear solid-state NMR.

Abstract:

:Single crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), and solid-state NMR (SSNMR) techniques are used to analyze the structures of two nonsolvated polymorphs of {4-(4-chloro-3-fluorophenyl)-2-[4-(methyloxy)phenyl]-1,3-thiazol-5-yl} acetic acid. These polymorphs are enantiotropically-related with a thermodynamic transition temperature of 35 +/- 3 degrees C. The crystal structure of Form 1, which is thermodynamically more stable at lower temperatures, was determined by SCXRD. The crystal structure of Form 2 was determined using PXRD structure solution methods that were assisted using two types of SSNMR experiments, dipolar connectivity experiments and chemical shift measurements. These experiments determined certain aspects of local conformation and intermolecular packing in Form 2 in comparison to Form 1, and provided qualitative knowledge that assisted in obtaining the best possible powder structure solution from the X-ray data. NMR chemical shifts for 1H, 13C, 15N, and 19F nuclei in Forms 1 and 2 are sensitive to hydrogen-bonding behavior, molecular conformation, and aromatic pi-stacking interactions. Density functional theory (DFT) geometry optimizations were used in tandem with Rietveld refinement and NMR chemical shielding calculations to improve and verify the Form 2 structure. The energy balance of the system and other properties relevant to drug development are predicted and discussed.

journal_name

J Pharm Sci

authors

Vogt FG,Katrincic LM,Long ST,Mueller RL,Carlton RA,Sun YT,Johnson MN,Copley RC,Light ME

doi

10.1002/jps.21336

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

4756-82

issue

11

eissn

0022-3549

issn

1520-6017

pii

S0022-3549(16)32769-1

journal_volume

97

pub_type

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