Green trichotomine derivatives bearing alkyl groups on C1 and C1′ were prepared. In their absorption spectra, the λmax shifted to longer wavelengths as the 1,1′-substituents became bulkier, and the bathochromism indicated twisting of the central C2=C2′ double bond. A 1,1′ -dimethyltrichotomine derivative underwent autooxidation to give orange-red 1,11b-dihydroxylated and 1,11b-seco-dicarbonyl compounds, in which twisting of the central C2=C2′ double bond might be relieved by the decreasing steric interactions between the substituents on C1 and the C3′ carbonyl groups.
制备了 C1 和 C1′上带有烷基的绿色
毛果芸香碱衍
生物。在它们的吸收光谱中,随着 1,1′-取代基的体积变大,λmax 移动到了更长的波长,浴色作用表明中心 C2=C2′ 双键发生了扭曲。一种 1,1′-二
甲基三羰基胺衍
生物经过自
氧化作用生成了橙红色的 1,11b-二羟基化合物和 1,11b-共二羰基化合物,其中 C2=C2′ 双键中心的扭曲可能因 C1 上的取代基和 C3′ 羰基之间的立体相互作用减弱而得到缓解。