The present invention relates to derivatives of the 1H-pyrano[4,3-b]benzofuran-1-one structure and their nitrogen analogues which possess powerful antioxidant properties combined with a highly effective UV absorbing functionality in one molecule. These compounds are especially useful in cosmetical and dermatological formulations.
The enzymes tyrosinase and laccase from a crude extract of the button mushroom (Agaricus bisporus) can be employed to catalyze the domino reaction between phenol and various cyclic 1,3-dicarbonyls using atmospheric oxygen as the oxidizing agent and yielding annulated benzofuranes in a highly efficient and sustainable manner.
Electrochemical oxidation of catechols in the presence of 4-hydroxy-6-methyl-2-pyrone
作者:Davood Nematollahi、Zinat Forooghi
DOI:10.1016/s0040-4020(02)00422-2
日期:2002.6
Electrochemicaloxidation of catechols (1a–1c) has been studied in the presence of 4-hydroxy-6-methyl-2-pyrone (3) as nucleophile in aqueous solution, using cyclic voltammetry and controlled-potential coulometry. The results indicate that the quinones derived from catechols (1a–1c) participate in Michael addition reactions with 3 to form the corresponding heterocyclic compounds (6a–6c). In this work