Synthesis of 2-sulphur-substituted 1,4-anthraquinones. Application to the Synthesis of Anthracyclinone Precursors
摘要:
2-sulphur-substituted 1,4-anthraquinones 8a,b and 10 have been prepared by annelation reactions of the anions of furanones 5a,b with naphthoquinone monoketals of type 6 and 9. Diels-Alder reaction of the 1,4-anthraquinones 11a,b with (E)-1,3-bis(trimethylsilyloxy)buta-1,3-diene (12) affords ABCD tetracyclic systems related to those existing in anthracyclinones.
Synthesis of 2-sulphur-substituted 1,4-anthraquinones. Application to the Synthesis of Anthracyclinone Precursors
作者:P Asenjo
DOI:10.1016/00404-0399(50)17395-
日期:1995.11.6
2-sulphur-substituted 1,4-anthraquinones 8a,b and 10 have been prepared by annelation reactions of the anions of furanones 5a,b with naphthoquinone monoketals of type 6 and 9. Diels-Alder reaction of the 1,4-anthraquinones 11a,b with (E)-1,3-bis(trimethylsilyloxy)buta-1,3-diene (12) affords ABCD tetracyclic systems related to those existing in anthracyclinones.
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
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