首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Eight new crystal structures of 5-(hydroxy-methyl)uracil, 5-carboxyuracil and 5-carboxy-2-thiouracil: insights into the hydrogen-bonded networks and the predominant conformations of the C5-bound residues
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Eight new crystal structures of 5-(hydroxy-methyl)uracil, 5-carboxyuracil and 5-carboxy-2-thiouracil: insights into the hydrogen-bonded networks and the predominant conformations of the C5-bound residues

机译:5-(羟甲基)尿嘧啶,5-羧脲和5-羧基-2-硫嘧啶的八种新晶体结构:洞察氢键网络和C5结合残留的主要构象

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摘要

In order to examine the preferred hydrogen-bonding pattern of various uracil derivatives, namely 5-(hydroxymethyl)uracil, 5-carboxyuracil and 5-carboxy-2-thiouracil, and for a conformational study, crystallization experiments yielded eight different structures: 5-(hydroxymethyl)uracil, C5H6N2O3, (I), 5-carboxy-uracil-N,N-dimethylformamide (1/1), CsH4N2O4-C3H7NO, (II), 5-carboxyura-cil-dimethyl sulfoxide (1/1), CsH^CVCzHgOS, (III), 5-carboxyuracil-N,N-dimethylacetamide (1/1), CSH4N2O4-C4H9NO, (IV), 5-carboxy-2-thiouracil-N,N-dimethylformamide (1/1), CsH4N2O3S-C3H7NO, (V), 5-carboxy-2-thioura-cil-dimethyl sulfoxide (1/1), CsH^OsSCzHgOS, (VI), 5-carboxy-2-thiouracil-1,4-dioxane (2/3), 2CsH4N2O3S-3C6H12O3, (VII), and 5-carboxy-2-thiouracil, C10H8N4O6S2, (VIII). While the six solvated structures, i.e. (II)-(VII), contain intramolecular S(6) O—H ? -O hydrogen-bond motifs between the carboxy and carbonyl groups, the usually favoured R22(8) pattern between two carboxy groups is formed in the solvent-free structure, i.e. (VIII). Further R22(8) hydrogen-bond motifs involving either two N—H ? -O or two N—H ? -S hydrogen bonds were observed in three crystal structures, namely (I), (IV) and (VIII). In all eight structures, the residue at the ring 5-position shows a coplanar arrangement with respect to the pyrimidine ring which is in agreement with a search of the Cambridge Structural Database for six-membered cyclic compounds containing a carboxy group. The search confirmed that coplanarity between the carboxy group and the cyclic residue is strongly favoured.
机译:为了检查各种尿嘧啶衍生物的优选的氢键合图案,即5-(羟甲基)尿嘧啶,5-羧脲尿嘧啶和5-羧基-2-硫嘧啶,以及一致性研究,结晶实验产生了八种不同的结构:5- (羟甲基)Uracil,C5H6N2O3,(I),5-羧基 - 尿嘧啶-N,N-二甲基甲酰胺(1/1),CSH4N2O4-C3H7 NO,(II),5-羧脲-CIL-二甲基磺砜(1/1), CSH ^ CVCZHGOS,(III),5-羧脲脲-N,N-二甲基乙酰胺(1/1),CSH4N2O4-C4H9NO,(IV),5-羧基-2-硫嘧啶-N,N-二甲基甲酰胺(1/1), CSH4N2O3S-C3H7 NO,(V),5-羧基-2-硫脲-CIL-二甲基亚砜(1/1),CSH ^ OSSCZHGOS,(VI),5-羧基-2-硫嘧啶-1,4-二恶烷(2 / 3),2CH4N2O3S-3C6 -12O3,(VII)和5-羧基-2-硫嘧啶,C10H8N4O6S2,(VIII)。虽然六种溶剂化结构,即(ii) - (vii),含有分子内S(6)O-H? - 羧基和羰基之间的氢键基序,在无溶剂结构中形成两个羧基之间的通常有利的R22(8)图案,即(VIII)。另外R22(8)涉及两种N-H的氢键基序? -O或两个n-h?在三种晶体结构中观察到氢键,即(I),(IV)和(VIII)。在所有八个结构中,环5-位置的残留物显示相对于嘧啶环的共面条布置,这与携带羧基的六元环化合物的剑桥结构数据库进行搜索。搜索确认羧基与循环残余物之间的共面很强。

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