A combined experimental and theoretical study of the supramolecular self-assembly of the natural benzopyran 2,2-dimethyl-3-hydroxy-6-acetyl-chromane and its isomeric benzofuran 10,11-dihydro-10-hydroxytremetone
作者:Diego M. Gil、E. Lizarraga、G.A. Echeverría、O.E. Piro、C.A.N. Catalán、A. Ben Altabef
DOI:10.1016/j.molstruc.2017.05.137
日期:2017.10
at room temperature the epoxide is completely solvolyzed to give the corresponding diol (hydrolysis) or vicinal hydroxyl-methoxy (methanolysis) derivative. All the compounds involved in the above reactions were characterized by IR, Raman, H NMR and UV–vis spectroscopies, and by mass spectrometry. Density functional theory (DFT) computations were used to optimize the structure conformations. The optimized
摘要 药用植物 Sencecionutans 的主要代谢物 4HMBA 的环氧化作用会产生一种不稳定的环氧化物,最终形成四种衍生物的混合物,其中三种以前报道为天然产物。环氧化物产物很容易受到酚羟基对环氧基碳的分子内攻击,以产生苯并呋喃或色烷衍生物。当在室温下溶解在甲醇-水混合物中时,环氧化物完全溶解,得到相应的二醇(水解)或邻位羟基-甲氧基(甲醇分解)衍生物。参与上述反应的所有化合物均通过红外、拉曼、核磁共振和紫外-可见光谱以及质谱进行表征。密度泛函理论(DFT)计算用于优化结构构象。优化后的结构进一步进行了自然键轨道 (NBO) 和静电势分析。标题化合物(分别简称为3和4)的晶体结构通过X射线衍射法测定。化合物 3 在三斜 P-1 空间群中结晶,a = 6.4289 (6) A, b = 8.7120 (6) A, c = 10.952 (1) A, α = 92.280 (7)°, β