Pharmaceutical polymorph control in a drug-mimetic supramolecular gel. Issue 1 (14th October 2016)

• Record Type: Journal Article
• Authors: Foster, Jonathan A.; Damodaran, Krishna K.; Maurin, Antoine; Day, Graeme M.; Thompson, Hugh P. G.; Cameron, Gary J.; Bernal, Jenifer Cuesta; Steed, Jonathan W.
• Is Part Of: Chemical science. Volume 8:Issue 1(2017)
• Page Start: 78
• Page End: 84
• Publication Date: 2016-10-14
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6sc04126d
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A supramolecular gel designed to chemically mimic the structure of a pharmaceutical compound controls the polymorphic outcome of the crystallization of the substrate. Abstract : We report the synthesis of a bis(urea) gelator designed to specifically mimic the chemical structure of the highly polymorphic drug substance ROY. Crystallization of ROY from toluene gels of this gelator results in the formation of the metastable red form instead of the thermodynamic yellow polymorph. In contrast, all other gels and solution control experiments give the yellow form. Conformational and crystal structure prediction methods have been used to propose the structure of the gel and show that the templation of the red form by the targeted gel results from conformational matching of the gelator to the ROY substrate coupled with overgrowth of ROY onto the local periodic structure of the gel fibres.