Regioselective oxidation of 3-monosubstituted juglone derivatives
作者:Elias A Couladouros、Alexandros T Strongilos
DOI:10.1016/s0040-4039(99)02112-7
日期:2000.1
Derivatives of 3-substituted juglones with either electron-withdrawing or -donating substituents are regioselectively oxidized to o- or p-naphthoquinones using salcomine/air or [bis(trifluoroacetoxy)iodo]benzene, respectively. The structure of the oxidation products was confirmed by chemical transformations. A correlation between chemical shift of the single quinoid proton and the quinone structure was established
A general route for total synthesis of 9-alkyl-9-hydroxy aklavinones and pyrromycinones
作者:Frank M. hauser、Subbaro prasanna
DOI:10.1016/s0040-4020(01)91533-9
日期:1984.1
-A general route for convergent, regiospecific synthesis of 9-alkyl-9-hydroxy anthracyclinones with the aklavin and pyrromycin oxygenation patterns is described.
KOtBu mediated addition of sulfonylphthalides to p-quinone methides led to the selective synthesis of isochroman-1,4-diones and addition products. Furthermore, a few addition products were transformed into functionalized heterocyclic molecules.
作者:Elias A. Couladouros、Zoi F. Plyta、Alexandros T. Strongilos、Vassilios P. Papageorgiou
DOI:10.1016/s0040-4039(97)01687-0
日期:1997.10
A new general and convergent route for the synthesis of the title compounds is presented. The polyoxygenated aromatic ring system is annulated in one operation by the condensation of a Michael type acceptor with an 1,4 dipole equivalent. The chiral center of the target is introduced via an asymmetric allyl boration in high ee. Overall, the fully protected natural product is constructed within 8 steps in 35% total yield. (C) 1997 Elsevier Science Ltd.
A new route to benzo[a]naphthacene-8,13-diones: synthesis and revision of the structure proposed for G2N