Polycyclic Hydroxyquinones. Part 29. Regioselective Reactions of 5-sulphur-substituted furan-2(5H)-one anions with naphthoquinone monoketals. Application to the synthesis of anthracyclinone precursors
作者:Pablo Asenjo、Francisco Fariña、M.Victoria Martín、M.Carmen Paredes、J.Javier Soto
DOI:10.1016/s0040-4020(96)01100-3
日期:1997.2
afford exclusively the C-5 substituted Michael adducts in good yield. The annelation reactions of the anions generated from furanones 30 and 33 with naphthoquinone monoketals 11 and 12 lead to 2-sulphur-substituted 1,4-anthraquinones 32, 35 and 36. Diels-Alder reaction of the 1,4-anthraquinones 41 and 42 with (E)-1,3-bis[(trimethylsilyl)oxy]buta-1,3-diene (37) affords ABCD tetracyclic systems related
呋喃酮7 – 10的阴离子与萘醌单缩酮11 – 15反应,以高收率完全提供C-5取代的Michael加合物。从呋喃酮产生的阴离子的成环反应30和33与萘醌单缩酮11和12引到2-硫取代的1,4-亚蒽醌32,35和36。1,4-蒽醌41和42与(E)-1,3-双[(三甲基甲硅烷基)氧基] buta-1,3-二烯的Diels-Alder反应(37)提供了与蒽环素存在的那些相关的ABCD四环系统。