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Identification of robust synthon in the molecular salts of 2-aminothiazole with substituted benzoic acids: A case study

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Abstract

Six new salts of an API intermediate 2-aminothiazole with different carboxylic acid coformers were synthesized and characterized by IR (Infrared spectroscopy), 1H-NMR, DSC (Differential scanning calorimetry), XRPD (X-ray powder diffraction) and single crystal XRD. The crystal structure of the salts with benzoic acid, 2,3-, 2,4-, 2,5-, 2,6- dihydroxybenzoic acids and 2,4-dinitrobenzoic acid were determined. The thiazole moiety exhibited solvent (polarity) assisted tautomerism in all reported salts and proton transfer was noticed to the ring N of thiazole due to which two point supramolecular synthon N+−H(thiazole)⋯O(acid), N−H(amine)⋯O(acid) was observed. The crystal structures were studied with respect to the positional effect of the competing functional groups like hydroxyl (−OH) and nitro (−NO2) as well as their donor and acceptor abilities for hydrogen bonding. The presence of the non-conventional hydrogen bond (C−H⋯O) has been found to play a critical role in the formation of secondary supramolecular architectures.

A series of new salts of 2-aminothiazole with substituted benzoic acids were reported and the robustness of the two point supramolecular synthon is explored.

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Acknowledgements

D R T and M O would like to acknowledge the Director and HOD (Chemistry Department), NITK Surathkal for providing the research infrastructure. M O is grateful to NITK Surathkal for the fellowship. D R T and M O are also thankful to the Metallurgy Department for the PXRD facility. D R T and M O are indebted to the CSMCRI for extending NMR facility.

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Correspondence to DARSHAK R TRIVEDI.

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IR spectral data of the salts;1H NMR spectra of the salts; DSC of the salts; XRPD of the bulk salt samples. Crystallographic information files (CIF’s) have been deposited at the Cambridge Crystallographic Data Centre; CCDC Nos. 919166 for 1a, 919167 for 1b, 919168 for 1c, 919169 for 1d, 919171 for 1e, 924125 for 1f. This material is available free of charge via internet at http://www.ccdc.cam.ac.uk or E-mail: deposit@ccdc.cam.ac.uk.

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ORUGANTI, M., PALLEPOGU, R. & TRIVEDI, D.R. Identification of robust synthon in the molecular salts of 2-aminothiazole with substituted benzoic acids: A case study. J Chem Sci 126, 1291–1302 (2014). https://doi.org/10.1007/s12039-014-0693-x

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