Some 2- or 6-acyl-5,8-dimethoxy-1,4-naphthoquinone (DMNQ) derivatives were synthesized and evaluated for inhibition of DNA topoisomerase I and cytotoxicity against L1210 cells. Compared with 2-acyl-DMNQ derivatives, 6-acyl-DMNQ compounds, bearing a higher electrophilic quinone moiety, showed a higher potency in the inhibition of DNA topoisomerase I and the cytotoxicity, implying the possible participation
A Convenient and Efficient Synthesis of 2-Acetyl-5,8-Dimethoxy-1,4-Naphthoquinone
作者:Jia-hua Cui、Wen Zhou、Shao-shun Li
DOI:10.3184/174751912x13335407984808
日期:2012.5
A convenient and efficientsynthesis of the important naphthazarin derivative 2-acetyl-5,8-dimethoxy-1,4-naphthoquinone is introduced in this paper. The key steps of the synthetic strategy involve the selective demethylation of 2-acetyl-1,4,5,8-tetramethoxynaphthalene with anhydrous aluminum chloride and subsequent oxidation of the demethylated product by cerium ammonium (IV) nitrate. Compared with
The 2- or 6-(α-Hydroxyalkyl- and α-Oxoalkyl)-5,8-dimethoxy-1,4-naphthoquinones from the Oxidative Demethylation of 2-(α-Hydroxyalkyl- and α-Oxoalkyl)-1,4,5,8-tetramethoxynaphthalenes with Cerium(IV) Ammonium Nitrate, and the Further Demethylations to Naphthazarins
作者:Yasuhiro Tanoue、Akira Terada
DOI:10.1246/bcsj.61.2039
日期:1988.6
Oxidative demethylation of 2-(α-hydroxyalkyl- and α-oxoalkyl)-1,4,5,8-tetramethoxynaphthalene with (NH4)2Ce(NO3)6 gave two isomeric dimethoxynaphthoquinones: 2-substituted and 6-substituted 5,8-dimethoxy-1,4-naphthoquinones. Further demethylations of the former isomers to the corresponding dihydroxynaphthoquinones required an AgO–40%HNO3 reagent, while the latter isomers needed AlCl3 as the demethylation
A Facile Synthesis of 2-Alkoxy(hydroxy)-5,8-dimethoxy-1,4-naphthoquinones by Acid-Catalysed Addition of Water or Alcohols to 5,8-Dimethoxy-1,4-naphthoquinones
作者:Francisco Fariña、Roberto Martinez-Utrilla、M. Carmen Paredes
DOI:10.1055/s-1981-29426
日期:——
Valderrama, J. A.; Paredes, M. C.; Pessoa-Mahana, C. D., Anales de Quimica, 1995, vol. 91, # 3-4, p. 214 - 219
作者:Valderrama, J. A.、Paredes, M. C.、Pessoa-Mahana, C. D.