An X-ray crystallographic study of C-5 and C-6 substituted 1,3-dimethyl-6-aminouracil architectures
作者:Binoy K. Saikia、Subrata Das、Balasubramaniam Sridhar、Ashim J. Thakur
DOI:10.1007/s10870-012-0305-x
日期:2012.7
Uracil, one of the four RNA bases is a vital component in the complex processes of molecular genetics. The correct functioning of these processes depends on the types of bonds formed by uracil with the surroundings. This communication elaborates the versatile potential of 1,3-dimethyl-6-aminouracil (L1) to form its 5-, 6- position substituted derivatives with different significant molecular packing behaviours. Presently, five crystals (L2-L6) have been synthesised and their crystallographic architectures are glimpsed in this paper. Analysis of crystal packing shows supra-molecular behaviours through hydrogen bonding and π-π interactions among the molecules in maintaining the integrity of the structures. The ligand 6,6’-diamino-1,1’,3,3’-tetramethyl-5,5’-(benzylidene)bis[pyrimidine-2,4(1H,3H)-dione] was observed to be stabilised in a helical arrangement. Versatile potential of 1, 3-dimethyl-6-aminouracil to form its 5-, 6- position substituted derivatives e.g. 6,6’-diamino-1,1’,3,3’-tetramethyl-5,5’-(benzylidene)bis[pyrimidine-2,4(1H,3H)-dione] in a helical arrangement.
尿嘧啶是四种 RNA 碱基之一,是分子遗传学复杂过程的重要组成部分。这些过程的正确运作取决于尿嘧啶与周围环境形成的键的类型。这篇通讯阐述了 1,3-二甲基-6-氨基尿嘧啶(L1)形成其 5-、6-位取代衍生物的多功能潜力,这些衍生物具有不同的显著分子堆积行为。目前,本文已合成了五种晶体(L2-L6),并对它们的晶体结构进行了介绍。晶体堆积分析表明,分子间通过氢键和 π-π 相互作用产生了超分子行为,从而保持了结构的完整性。据观察,配体 6,6'-diamino-1,1',3,3'-tetramethyl-5,5'-(benzylidene)bis[pyrimidine-2,4(1H,3H)-dione] 呈螺旋状稳定排列。1,3-二甲基-6-氨基脲嘧啶具有以螺旋排列方式形成其 5-、6-位取代衍生物(如 6,6'-二氨基-1,1',3,3'-四甲基-5,5'-(亚苄基)双[嘧啶-2,4(1H,3H)-二酮]的多功能潜力。