Studies on polynuclear furoquinones. Part 1: Synthesis of tri- and tetra-cyclic furoquinones simulating BCD/ABCD ring system of furoquinone diterpenoids
作者:Faruk Hasan Shaik、Gandhi Kumar Kar
DOI:10.3762/bjoc.5.47
日期:——
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。