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A Novel Mechanism of Preferential Enrichment Phenomenon Observed for the Cocrystal of ( RS )‐2‐{4‐[(4‐Chlorophenoxy)methyl]phenoxy}propionic Acid and Isonicotinamide

Abstract : A new entry of chiral anti‐hyperlipoproteinemia drug is reported, showing an excellent preferential enrichment (PE) phenomenon which is not caused by a polymorphic transition during crystallization, but is proposed to occur by a novel mechanism involving partially irregular stacking of R and S homochiral two‐dimensional (2D) sheets with a large dipole moment, followed by selective redissolution of one homochiral 2D sheet into the mother liquor during crystallization. The cocrystal composed of (RS)‐2‐{4‐[(4‐chlorophenoxy)methyl]phenoxy}propionic acid (CPPPA) and achiral isonicotinamide exhibited a substantial enrichment in the mother liquor up to 93 % ee by simply repeating recrystallization under nonequilibrium conditions using high supersaturation. Furthermore, the deposited crystals with low ee values obtained at the end of PE experiment were second harmonic generation (SHG)‐positive, indicating the formation of homochiral domains in the deposited crystals, which reflects the proposed mechanism of PE.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02375787
Contributor : Simon Clevers <>
Submitted on : Friday, November 22, 2019 - 10:59:11 AM
Last modification on : Monday, May 18, 2020 - 2:12:02 PM

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Hiroki Takahashi, Yuki Numao, Junko Motokawa, Simon Clevers, Gérard Coquerel, et al.. A Novel Mechanism of Preferential Enrichment Phenomenon Observed for the Cocrystal of ( RS )‐2‐{4‐[(4‐Chlorophenoxy)methyl]phenoxy}propionic Acid and Isonicotinamide. Chemistry - A European Journal, Wiley-VCH Verlag, 2019, 25, pp.16405-16413. ⟨10.1002/chem.201904130⟩. ⟨hal-02375787⟩

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