中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1,5-bis(2'-chloroprop-2'-enyloxy)anthraquinone | 101417-87-2 | C20H14Cl2O4 | 389.235 |
蒽绛酚 | 1,5-dihydroxyanthraquinone | 117-12-4 | C14H8O4 | 240.215 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-(2'-chloroprop-2'-enyl)-5-(2''-chloroprop-2''-enyloxy)-1-methoxyanthraquinone | 164937-14-8 | C21H16Cl2O4 | 403.262 |
—— | 2-(2'-chloroprop-2'-enyl)-1,5-dimethoxyanthraquinone | 160697-51-8 | C19H15ClO4 | 342.779 |
—— | 2,6-bis(2'-chloroprop-2'-enyl)-1,5-dihydroxyanthraquinone | 113681-13-3 | C20H14Cl2O4 | 389.235 |
—— | 2-(2'-chloroprop-2'-enyl)-1,5-dihydroxyanthraquinone | 160697-50-7 | C17H11ClO4 | 314.725 |
—— | 1,5-dimethoxy-2-(oxopropyl)-9,10-anthra-quinone | 116162-09-5 | C19H16O5 | 324.333 |
—— | 7-methoxy-2-methyl-8-(2'-oxopropyl)-6,11-dihydroanthra<1,2-b>furan-6,11-dione | 101417-92-9 | C21H16O5 | 348.355 |
—— | methyl (3S)-3-hydroxy-4-(7'-methoxy-2'-methyl-6',11'-dioxo-6',11'-dihydroanthra<1',2'-b>furan-8'-yl)-3-methylbutanoate | 157029-37-3 | C24H22O7 | 422.434 |
—— | 7-hydroxy-2-methyl-8-(2'-oxopropyl)anthra<1,2-b>furan-6,11-dione | 164937-15-9 | C20H14O5 | 334.328 |
Fridamycin E (1) has been synthesized in six steps from the anthrarufin mono(chloroallyl) ether (10). The synthesis was based on a titanium-mediated aldol-like addition of a (-)- menthyl acetate enolate to the ketone (9). Similar additions to the aldehydes (23) and (25) are reported.
6-(1'-Formyl)-1,5-dimethoxy-2-(2″-oxopropyl) anthraquinone (1), a key intermediate in Danishefsky's synthesis of vineomycinone B2 methyl ester (5), has been prepared by a new route from anthrarufin (6) via the intermediate 1-methoxy-2-(2′-methylprop-2′-enyl)-5-(2′-methylprop-2′-enyloxy) anthraquinone (20). An alternative synthesis of the diketone (40) has been achieved via Claisen rearrangement of (20) and a subsequent ozonolysis of the resulting bis ( methylpropenyl ) anthraquinone (26). Other routes to (1) from anthrarufin have been developed. In one, compound (1) was formed in yields of 10-16% as an anomalous product from the ozonolysis of (27). Ozonolyses of mixtures of (27), (37) and (44), obtained by isomerization of (27), afforded (1) in yields of 28-43%. Isomerization of the diphenol (25) with palladium(II) chloride bis ( acetonitrile ) in refluxing chloroform proceeds at a faster rate than the isomerization of (27), thereby affording the mono isomerized diphenol (38) in 37% yield. Methylation of (38) affords (37), a known precursor of (1).