engleski

DEVELOPMENT OF HPLC METHOD FOR IMPURITY PROFILING OF 7-ETHYLTRYPTOPHOL-THE FIRST STEP IN AN LC-SPE-NMR APPROACH

7-Ethyltryptophol, 2(7-ethyl-1H-indol-3- yl)ethanol, is a key starting material in the synthesis of Etodolac, a non-steroidal anti- inflammatory drug (Scheme 1). Depending on the synthetic pathway for 7- ethyltryptophol, commercially available material comprises many different impurities which can cause formation of coproducts in the synthesis of Etodolac thus complicating the purification of the final product.[1] Therefore, to develop an optimal purification procedure of Etodolac, it is important to know the structures of impurities in 7- ethyltryptophol. LC-SPE-NMR methodology is a powerful tool for fast identification and structural elucidation of low concentration level impurities and degradation products in pharmaceuticals.[2] In this study we report on the HPLC method for efficient separation of impurities in 7- ethyltryptophol as the first step in hyphenated LC-SPE-NMR analysis. References 1. M. C. Sekharayya, G. V. Narayana, S. Nigam, G. Madhusudhan, Indian J. Chem. 51B (2012) 1763-1766. 2. S. Singh, T. Handa, M. Narayanam, A. Sahu, M. Junwal, R. P. Shah, J. Pharm. Biomed. Anal. 69 (2012) 148-173. Acknowledgements: This work was funded by European Regional Development Fund and Croatian state budget (project Met4Pharm).

7-Ethyltryptophol; Purity; Structures of impurities; HPLC method; LC-SPE-NMR analysis

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