Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 3 (March 2007)

organic compounds

sk3083 scheme

Acta Cryst. (2007). C63, o147-o151 [ doi:10.1107/S0108270107001461 ]

N-Benzyltetrahydropyrido-anellated thiophene derivatives: new anticholinesterases

M. Pietsch, M. Nieger and M. Gütschow

Abstract: The title compounds, tert-butyl 6-benzyl-2-(3,3-diethylureido)-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3-carboxylate, C₂₄H₃₃N₃O₃S, (I), 7-benzyl-2-diethylamino-5,6,7,8-tetrahydro-3-oxa-9-thia-1,7-diazafluoren-4-one, C₂₀H₂₃N₃O₂S, (II), and N-(7-benzyl-4-oxo-5,6,7,8-tetrahydro-4H-3,9-dithia-1,7-diazafluoren-2-yl)benzamide, C₂₃H₁₉N₃O₂S₂, (III), form monoclinic crystal systems. In (I) and (II), the molecules are linked into a three-dimensional framework by weak intermolecular C-HO=C hydrogen bonds, whereas in (III) stronger intermolecular N-HO=C interactions are observed. The conformation of (I) is further stabilized by an intramolecular N-HO=C hydrogen bond, which effects the planarity of the ureidothiophenecarboxylate moiety.

Formula: C₂₄H₃₃N₃O₃S, C₂₀H₂₃N₃O₂S and C₂₃H₁₉N₃O₂S₂


	Structure factor file (CIF format) (519.1 kbytes) [ doi:10.1107/S0108270107001461/sk3083Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (200.6 kbytes) [ doi:10.1107/S0108270107001461/sk3083IIsup3.hkl ] Contains datablock II

	Structure factor file (CIF format) (215.5 kbytes) [ doi:10.1107/S0108270107001461/sk3083IIIsup4.hkl ] Contains datablock III

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