Synthesis, Redox Properties and Antibacterial Activity of Hindered Phenols Linked to Heterocycles
作者:Vladimir N. Koshelev、Olga V. Primerova、Stepan V. Vorobyev、Ludmila V. Ivanova
DOI:10.3390/molecules25102370
日期:——
electrode in acetonitrile. The oxidation potentials of all substances were comparable to those of BHT. The obtained compounds were tested for their antibacterialactivity, and N-(2-(3,5-di-tert-butyl-4-hydroxyphenyl)-2-oxoethyl)isatin (32 μg/mL) exerted good activity against Staphylococcus aureus.
Synthesis of substituted 3,4-dihydropyrimidin-2(1H)-ones and pyrimidin-2(1H)-ones by the Biginelli reaction with 3,5-Di-tert-butyl-4-hydroxybenzaldehyde
作者:V. F. Sedova、V. P. Krivopalov、O. P. Shkurko
DOI:10.1134/s1070428009100200
日期:2009.10
Three-component acid-catalyzed cyclocondensation of 3,5-di-tret-butyl-4-hydroxybenzaldehyde with urea and ethyl acetoacetate or alpha-nitroacetophenone (Biginelli reaction) under homogeneous conditions gave the corresponding 5-substituted 3,4-dihydropyrimidin-2(1H)-ones having in position 4 of the heteroring an aryl substituent with sterically shielded hydroxy group. The condensation catalyzed by inorganic salts (Fe3+, Co2+, Zn2+, Li+) was successful only with ethyl acetoacetate as initial methylene-active component. Under analogous conditions, acetophenone and 4-fluoroacetophenone gave rise to 4,6-diarylpyrimidin-2(1H)-ones which are capable of undergoing phenol-quinonemethide tautomerism.