Synthesis of phenanthro[1,2-b]furan-10,11-dione, the core nucleus present in Tanshinone-I is described in 8-10 steps starting from 2-bromo-3,4-dihydro-1-naphthaldehyde. The bromoaldehyde was converted to methyl 2-(2-bromo-1-naphthyl)acetate or 2-(2-bromo-1-naphthyl)acetonitrile following the protocol of functional group transformations. Subsequent Suzuki coupling of this ester/nitrile derivative with
从 2-bromo-3,4-dihydro-1-naphthaldehyde 开始,以 8-10 个步骤描述了 phenanthro[1,2-b]furan-10,11-dione(
丹参酮-I 中存在的核心核)的合成。按照官能团转化的方案,将
溴醛转化为2-(2-
溴-1-
萘基)
乙酸甲酯或2-(2-
溴-1-
萘基)
乙腈。随后该酯/腈衍
生物与
呋喃-2-
硼酸的 Suzuki 偶联产生[2-(2-
呋喃基)-1-
萘基]
乙酸酯/腈,其
水解提供相应的酸衍
生物。酸环化,然后用 Fremy 盐氧化
苯酚,产生四环
呋喃醌,
菲 [1,2-b]
呋喃-10,11-二酮。该方法也已扩展用于合成
三环呋喃醌、
萘并[1,2-b]
呋喃-4,5-二酮。