The chemical formua of glimepiride is 1-{4-[2-(3-ethyl-4-methyl-2-oxo-2,5-dihydro- 1H-pirrol-1-carboxamido)ethyl]phenylsulphonyl}-3-trans-(4-methylocykloheksyl)urea. Glimepiride is a new oral antidiabetic drug in the sulfonylurea class having a prolonged effect. Glimepiride synthesis is outlined in Scheme [1].

The single crystal structure of Glimepiride (G7) was determined by W. Grell & col. [3] (code: TOHBUN01 in database CSD). An aim of our work was the determination of unknown crystal structure of compounds G3 and G5. The crystal structures of the G3 and G5 were determined using single crystal X-ray diffraction method. We have found that commercial G3 contained contamination, which was identified as N,N'-bis(2-phenylethyl)urea (X3) [4]. Conformation of molecules and their packing in the crystal structures (Figure 1 and 2 shows the projestion of molecules) will be discussed .

References:

¹ EP0031058 -1981-07-01 (HOECHST AG), "Sulfonyl ureas, processes for their preparation and pharmaceutical compositions containing these compounds".

² C. Michaux & col., Acta Cryst., 2002, C58, 621-623.

³ E. Yureiv & col., J. Med Chem., 2004, 39, 835-847.

⁴ W. Grell, R. Hurnaus, G. Griss, R. Sauter, E. Rupprecht, M. Mark, P. Luger, H. Nar, H. Wittenben, P. Muller, J. Med. Chem., 1998, 41, 5219.

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