The invention relates to the use of quinoxaline derivatives as photostable UV filters in cosmetic and pharmaceutical preparations for protecting the human epidermis or human hair against UV radiation, especially in the 280-400 nm range.
Obafemi Craig A., Pfleiderer Wolfgang, Helv. chim. acta, 77 (1994) N 6, S 1549-1556
作者:Obafemi Craig A., Pfleiderer Wolfgang
DOI:——
日期:——
Permanganate Oxidation of Quinoxaline and Its Derivatives
作者:Craig A. Obafemi、Wolfgang Pfleiderer
DOI:10.1002/hlca.19940770610
日期:1994.9.21
The oxidation reactions of a series of quinoxaline derivatives, using KMnO4 in the presence or absence of NaOH, are described. Neutral oxidation of 2-chloro- and 2, 3-dichloroquinoxalines 2–4 afforded the corresponding chloro- and dichloropyrazinedicarboxylic acids 13 and 14 in good yield. On the other hand, oxidation of quinoxalin-2(1H)-one and 1, 4-dihydroquinoxaline-2, 3-dione derivatives in alkaline