Polycyclic hydroxyquinones. XXVII. Tautomerism in 1,4-Dihydroxy-9,10-anthraquinone Monoimines. Cycloaddition Reactions of Their 1,4-Anthraquinonoid Tautomers
作者:Francisco Fariña、M.Teresa Molina、Pedro Noheda、M.Carmen Paredes
DOI:10.1016/s0040-4020(01)86592-3
日期:1992.9
substituted derivatives thereof (6a-i) have been prepared by ammonolysis of the corresponding 1,4-dihydroxy-9,10-anthraquinones. 1H- and 13C-n.m.r. studies show the existence of a rapid tautomeric equilibrium in quinone imines of type 6. Diels-Alder reaction with the 1,4-anthraquinonoid tautomer of quinone monoimines 6a,e affords ABCD tetracyclic systems related to those existing in anthracyclinones.
通过氨解相应的1,4-二羟基-9,10-蒽醌,制备了1,4-二羟基-9,10-蒽醌单亚胺及其不同取代的衍生物(6a-i)。1 H和13 C-nmr研究表明,在6型醌亚胺中存在快速的互变异构平衡。与醌单亚胺6a,e的1,4-蒽醌类互变异构体进行Diels-Alder反应,可得到与蒽环类化合物中存在的ABCD四环体系相关的ABCD四环体系。