作者:Qian Wang、Wei Cui、Jian Yang、Bo Yang
DOI:10.3184/174751915x14307337733513
日期:2015.5
Two novel routes for the synthesis of the flavonoid chrysin are described. In the first, 3,5-dimethoxyphenol (taxicatigenin) was converted to 2-hydroxy-4,6-dimethoxyacetophenone and then by condensation with benzaldehyde to 2′-hydroxy-4′,6′-dimethoxychalcone. The latter was cyclised with iodine and demethylated with pyridine hydrochloride to form chrysin in 50% overall yield. In the second route, taxicatigenin
描述了合成黄酮类白杨素的两条新途径。首先,3,5-二甲氧基苯酚(taxicatigenin)转化为2-羟基-4,6-二甲氧基苯乙酮,然后与苯甲醛缩合为2'-羟基-4',6'-二甲氧基查尔酮。后者用碘环化并用吡啶盐酸盐去甲基化形成白杨素,总产率为 50%。在第二条路线中,taxcatigenin 在特殊条件下与肉桂酰氯酰化形成查耳酮。然后分别以 42% 和 56% 的总产率将其转化为白杨素。先前合成的几个缺点,如反应时间长、处理繁琐和总产率低等,已被克服。