A New Class of Phenazines with Activity against a Chloroquine Resistant Plasmodium falciparum Strain and Antimicrobial Activity
摘要:
New phenazines were synthesized by oxygenation of 1- and 2-naphthol with transition metal peroxo complexes and in situ reaction with 1,2-diamines. The title compounds were evaluated for in vitro antimalarial activity against Plasmodium falciparum and chloroquine-resistant strains. Phenazines 12, 27, and 28 were most prominent in growth inhibition. In vivo protection against cerebral malaria was observed with the phenazines 11, 12, 20, and 27, whereas partial protection was provided by 19.
Hypoiodite-catalysed oxidative homocoupling of arenols and tandem oxidation/cross-coupling of hydroquinones with arenes
作者:Muhammet Uyanik、Dai Nagata、Kazuaki Ishihara
DOI:10.1039/d1cc05171g
日期:——
We report the hypoiodite-catalyzed oxidative C–C homocoupling of arenols to biarenols or biquinones using aqueous hydrogen peroxide as an oxidant. In addition, by combining hypoiodite catalysis and lipophilic Lewis acid-assisted Brønsted acid catalysis under aqueous conditions, we achieved a tandem oxidation/cross-coupling reaction of hydroquinones with electron-rich arenes. These results highlight
Solvent-controlled selective synthesis of biphenols and quinones via oxidative coupling of phenols
作者:Nagnath Yadav More、Masilamani Jeganmohan
DOI:10.1039/c7cc04829g
日期:——
A regioselective synthesis of unsymmetrical and symmetrical biphenols and binaphthols via oxidativecoupling of phenols or naphthols in the presence of K2S2O8 in CF3COOH at ambient conditions is described. Interestingly, 1:1 ratio of H2O and CH3CN solvent mixtures at 80 °C instead of CF3COOH provided substituted unsymmetrical quinones. A gram scale synthesis of biphenols and binaphthols was demonstrated
描述了在环境条件下在CF 3 COOH中在K 2 S 2 O 8存在下通过酚或萘酚的氧化偶联的不对称和对称的双酚和联萘酚的区域选择性合成。有趣的是,在80°C的H2O和CH3CN溶剂混合物以1:1的比例代替CF3COOH提供了取代的不对称醌。证明了双酚和联萘酚的克级合成。
An Evaluation of Some Hindered Diamines as Chiral Modifiers of Metal-Promoted Reactions
作者:Jayamini Illesinghe、Richard Ebeling、Brett Ferguson、Jim Patel、Eva M. Campi、W. Roy Jackson、Andrea J. Robinson
DOI:10.1071/ch03238
日期:——
coordinate to osmium. Less hindered analogues of these ligands were prepared and some were shown to act as ligands in dihydroxylation reactions but with poor enantioselectivity (e.e. < 10%). The diamines have also been briefly evaluated as ligands in rhodium-catalyzed hydroformylation and copper-catalyzed phenolic coupling reactions. Once again, only low enantioselectivity was obtained.
Lösungsmittel (L) und der Temp, untersucht. Dabei kann zwischen Reaktionen über Radikalionenpaare (L = CH3CN) bzw. H‐Abstraktion über freie Radikale (L = CH3OH) differenziert werden. Die Sauerstoff‐übertragung auf die Naphtholderivate unterscheidet sich mechanistisch deutlich vonderOxygenierung des 2, 6‐Di‐tert.‐butylphenols (6), die nur uncharakteristisch von L und der Temp, abhängig ist.