Regiospecific nucleophilic aromatic substitution: conjugate addition of active methylene compounds to quinone monoacetals and aromatization of the adducts
Regiospecific nucleophilic aromatic substitution: conjugate addition of active methylene compounds to quinone monoacetals and aromatization of the adducts
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
Synthesis of C-aryl glycosides related to the chrysomycins
作者:David J Hart、Gregory H Merriman、David G.J Young
DOI:10.1016/0040-4020(96)00876-9
日期:1996.11
A synthesis of chrysomycin substructure 44 is described in which a Ramberg-Backlund reaction plays a key role. Electrochemical oxidation of 44 provided 45, and unsuccessful attempts to convert 45 to chrysomycin B (2) are presented.
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.
PARKER K. A.; KANG S.-K., J. ORG. CHEM., 1980, 45, NO 7, 1218-1224