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A 2′‐deoxycytidine long‐linker click adduct forming two conformers in the asymmetric unit

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The title compound {systematic name: 4‐amino‐1‐(2‐deoxy‐β‐derythro‐pentofuranosyl)‐5‐[6‐(1‐benzyl‐1H‐1,2,3‐triazol‐4‐yl)hex‐1‐ynyl]pyrimidin‐2(1H)‐one}, C24H28N6O4, shows two conformations in the crystalline state, viz. (I‐1) and (I‐2). The pyrimidine groups and side chains of the two conformers are almost superimposable, while the greatest differences between them are observed for the sugar groups. The N‐glycosylic bonds of both conformers adopt similar anti conformations, with χ = −168.02 (12)° for conformer (I‐1) and χ = −159.08 (12)° for conformer (I‐2). The sugar residue of (I‐1) shows an N‐type (C3′‐endo) conformation, with P = 33.1 (2)° and τm = 29.5 (1)°, while the conformation of the 2′‐deoxyribofuranosyl group of (I‐2) is S‐type (C3′‐exo), with P = 204.5 (2)° and τm = 33.8 (1)°. Both conformers participate in hydrogen‐bond formation and exhibit identical patterns resulting in three‐dimensional networks. Intermolecular hydrogen bonds are formed with neighbouring molecules of different and identical conformations (N—H...N, N—H... O, O—H...N and O—H...O).
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Document Type: Research Article

Publication date: April 15, 2012

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