Structural study of 8-azole derivatives of protoberberine alkaloids: experimental and quantum chemical approach
作者:Lukáš Maier、Tomáš Šolomek、Matej Pipíška、Zdeněk Kříž、Marek Nečas、Radek Marek
DOI:10.1016/j.tet.2010.09.030
日期:2010.11
New derivatives of protoberberinealkaloids were prepared by nucleophilic addition of some azoles (differing in bulkiness) to the iminium functionality of the quaternaryprotoberberinealkaloids. Compounds were structurally characterized mainly by 1H and 13C NMR spectroscopy, and the structure of 8-carbazol-1-yl-7,8-dihydroberberine was determined using single-crystal X-ray diffraction. Additionally
新的小ber碱生物碱衍生物是通过亲核加成一些吡咯(体积不同)到季pro小ber碱生物碱的亚胺官能团而制得的。主要通过1 H和13 C NMR光谱对化合物进行结构表征,并使用单晶X射线衍射确定8-咔唑-1-基-7,8-二氢小ber碱的结构。另外,已经通过低温NMR光谱法和量子化学计算研究了唑部分的体积变化的五种衍生物的构象行为。吡咯和咔唑部分对选定的1 H NMR共振的环电流效应已得到表征,可视化和讨论。