Chiral Cyclobutane-Based Ureas as Versatile Platforms to Tune Structural Diversity: An Experimental and Theoretical Approach
作者:Ona Illa、Eric Da Silva、Elisabeth Torres、Ángel Álvarez-Larena、Klaus Wurst、Rosa M. Ortuño、Vicenç Branchadell
DOI:10.1021/acs.cgd.3c01467
日期:2024.4.3
Four new chiral 2,2′-disubstituted biscyclobutane ureas have been synthesized and crystallized. Each of them bears a different substituent on positions 2,2′, that is, esters, hydroxymethyl groups, and carboxyl groups. The mode of aggregation of each urea in the crystal packing to form chains, helices, sheets, and others is tuned both by the intermolecular hydrogen bonds between the urea groups and
合成并结晶了四种新的手性2,2'-二取代双环丁烷脲。它们各自在2,2'位上带有不同的取代基,即酯、羟甲基和羧基。晶体堆积中每个脲形成链、螺旋、片等的聚集模式是通过脲基团之间的分子间氢键和取代基产生额外氢键的不同能力来调节的。借助计算计算使实验结果合理化,从而可以了解能量因素对观察到的优先结构稳定的贡献。