Acidity and Stability of 10-Substituted 1,8-Dihydroxy-9(10H)-anthracenones
作者:Klaus Müller、Ingo Gawlik、Wolfgang Wiegrebe
DOI:10.1002/ardp.19953280412
日期:——
The decomposition of 10‐substituted anthralin derivatives in dimethylsulfoxide and ethanol was determined. While 10‐ω‐phenylalkylidene derivatives were thoroughly stable, 10‐ω‐phenylacyl‐substituted compounds were slowly degraded to danthron and the corresponding carboxylicacids. However, the stability of these derivatives was markedly improved as compared to that of anthralin. Determination of the
A Method for the Synthesis of 2,3-Disubstituted 2,3-Dihydrobenzofurans
作者:Danilo Annibali、Gerhard Ecker、Wilhelm Fleischhacker、Thomas Helml、Wolfgang Holzer、Christian R. Noe
DOI:10.1007/s007060050318
日期:2000.1.15
The synthesis of 2,3-disubstituted 2,3-dihydrobenzofuran diastereomers is described. The key step in the reaction sequence is the chemoselective reduction of a tert. alcohole with tert.-butylamine-borane/AlCl3. The relative configuration of the substituents on the dihydrofurane moiety was assigned via NMR spectroscopy.