Constituents of Rhizoma Nupharis. XXVI. Carbon-13 nuclear magnetic resonance spectra of nupharamine, anhydronupharamine, nuphamine, and related compounds.
作者:YOSHITAKA ITATANI、SHINGO YASUDA、MIYOJI HANAOKA、YOSHIO ARATA
DOI:10.1248/cpb.24.2521
日期:——
The 13C nuclear magnetic resonance (13C-NMR) spectra of the piperidine-type Nuphar alkaloids and their derivatives (I-V) were recorded with complete assignments. Two methyl groups of C-10 and C-11 in I and II were shown to be magnetically nonequivalent. The 13C-NMR spectroscopy was demonstrated to be more useful than 1H-NMR spectroscopy in studies on magnetic nonequivalence of dimethyl groups associated with molecular asymmetry. The shift values for some carbons caused by the introduction of the double bond, the hydroxyl group, and the acetyl group were examined.
记录了哌啶型 Nuphar 生物碱及其衍生物(I-V)的 13C 核磁共振(13C-NMR)光谱,并进行了完整的赋值。研究表明,I 和 II 中 C-10 和 C-11 的两个甲基在磁性上是不等价的。在研究与分子不对称有关的二甲基基团的磁性非等价性时,13C-NMR 光谱比 1H-NMR 光谱更有用。研究了引入双键、羟基和乙酰基引起的某些碳的位移值。