中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | Benzoic acid 1-acetoxy-8-methoxy-7,12-dioxo-1,2,3,4,7,12-hexahydro-benzo[a]anthracen-11-yl ester | 192801-96-0 | C28H22O7 | 470.478 |
The synthesis of the angucycline natural products hatomarubigin B and C in racemic form is described. The key step in the construction of the benz[a]anthraquinone skeleton of these molecules was the Diels–Alder reaction of the acetate of (E,1R*,5R*)-3-(2′-methoxyvinyl)-5-methylcyclohex-2-en-1-ol and 5-acetoxy-8-hydroxy-1,4-naphthoquinone. Methylation of the C11 phenolic group of the resulting cycloadduct, followed by aromatization of the B ring with subsequent deacylation gave (±)-hatomarubigin C. Oxidation of the latter compound with Dess-Martin periodinane, 1,1,1-triacetoxy-1,1-dihydro-1,2-benziodoxol-3(1H)-one, gave (±)-hatomarubigin B.