(4aR*,10aR*,10aR*)-10-Hydroxy-7-methoxy-3,4,4a,9,10,10a-hexahydrophenanthren-2(1H)-one (3) has been synthesised with the key step involving intramolecular electrophilic alkylation of the aromatic ring, via a Pummerer rearranged intermediate, to complete the B-ring of the phenanthrene nucleus. Phenanthrenones (4) and (5), bearing a 1-methyl or 1-ethyl group in an axial configuration, have also been
(4a R *,10a R *,10a R *)-10-羟基-7-甲氧基-
3,4,4a,9,10,10a-六氢
菲蒽-2(1 H)-一(3)已合成关键步骤涉及通过Pummerer重排中间体对芳环进行分子内亲电烷基化,以完成
菲核的B环。还通过平行途径制备了具有轴向构型的1-甲基或1-乙基的
菲蒽酮(4)和(5):在环化反应期间,α-位于1,3的1-烷基对-二
氧戊环保护基进行酸催化的差向异构,以得到所需轴向差向异构体的优势。