1,2,4-Triazolo[4,3-a]quinoxaline-1,4-diones as antiallergic agents
摘要:
A series of new 1,4-dihydro-1,2,4-triazolo[4,3-]quinoxaline-1,4-diones has been prepared. These compounds were tested as inhibitors of antigen-induced release of histamine (AIR) in vitro from rat peritoneal mast cells (RMC) and as inhibitors of IgE-mediated rat passive cutaneous anaphylaxis (PCA). Most of this new class of antiallergic agents showed good activity in the RMC and PCA tests. The most potent compound, 2-acetyl-7-chloro-5-n-propyl-1,2,4-triazolo[4,3-a]quinoxaline-1,4-dione (1x), with an I50 value of 0.1 microM, is 30 times more potent than disodium cromoglycate (DSCG) in the RMC assay.
Metal‐Free C3 Hydroxylation of Quinoxalin‐2(1
<i>H</i>
)‐ones in Water
作者:Sha Peng、Die Hu、Jia‐Li Hu、Ying‐Wu Lin、Shan‐Shan Tang、Hai‐Shan Tang、Jun‐Yi He、Zhong Cao、Wei‐Min He
DOI:10.1002/adsc.201901163
日期:2019.12.17
A practical protocol for the preparation of quinoxaline‐2,3(1H,4H)‐diones through direct C(sp2)−H hydroxylation of quinoxalin‐2(1H)‐ones in recyclable DL‐α‐Tocopherol methoxypolyethylene glycol succinate solution (2 wt% in water) (TPGS‐750‐M/H2O) was developed. The target products were exclusively generated and could be collected through extraction and recrystallization.