Synthesis of 5-hydroxy-6- and 8-methylflavones and their ultraviolet spectral differentiation
作者:Marcelle Hauteville、Marcelle Rakotovao、Marie-Christine Duclos、Bernard Voirin
DOI:10.1016/s0031-9422(97)00919-9
日期:1998.6
of neutral or acidic aluminium chloride. Several spectral characteristics may be deduced which are typical of the C-methyl group position and distinguish these compounds from their 6-and 8-methoxy homologues. Moreover, for flavones of each the above-mentioned groups, B-ring substitution at C-4′, C-3′, 4′ and C-3′, 4′, 5′ (hydroxy and/or methoxy groups) may be differentiated. On the other hand, spectral
摘要 在甲醇和中性或酸性氯化铝存在下,记录了 15 种天然合成 6- 和 8- 甲基黄酮(C-5 为羟基,C-7 为羟基或甲氧基)的紫外光谱。可以推断出几个光谱特征,它们是 C-甲基位置的典型特征,并将这些化合物与它们的 6-和 8-甲氧基同系物区分开来。此外,对于每个上述基团的黄酮,C-4'、C-3'、4'和C-3'、4'、5'(羟基和/或甲氧基)处的B环取代可以是有区别的。另一方面,8-甲基-黄酮和 8-(对羟基苄基)黄酮之间的光谱差异并不重要,以类似的方式在 C-4' 或 C-3'、4' 处单取代或双取代。在这项工作中,新合成了三种 6-甲基黄酮和四种 8-甲基黄酮。