Monooxygen donation potential of 4a-hydroperoxyflavins as compared with those of a percarboxylic acid and other hydroperoxides. Monooxygen donation to olefin, tertiary amine, alkyl sulfide, and iodide ion
An efficient and practical method for flavin-catalyzed aerobic oxidation of sulfides and thiols with formic acid/TEA is described.
一种高效实用的方法,用于利用呋喕催化的氧化硫醚和硫醇,使用甲酸/三乙胺。
Photochemistry of flavins with sulfur-activated carboxylic acids: identification and reactions of the photoproducts
作者:Gert A. Eberlein、Michael F. Powell
DOI:10.1021/ja00323a041
日期:1984.5
Photoreduction de methyl-3 lumiflavine par divers diacides carboxyliques α-sulfures ou α-disulfures (par exemple les acides thio-2,2' bis-acetique et dithio-2,2 bis-acetique) conduisant a des derives alkylthioxymethyl en 4a de l'isoalloxazine
光还原甲基-3 光黄素二酸二酸羧基α-硫或α-二硫(例如硫代-2,2' 双乙酸和二硫-2,2 双乙酸)的载体 a des 衍生烷基硫氧甲基 en 4a de l '异咯嗪
Greener Preparation of 5-Ethyl-4a-hydroxyisoalloxazine and Its Use for Catalytic Aerobic Oxygenations
is an important task for developing sustainable catalytic oxidation reactions. Although 5- ethyl-4a-hydroxyisoalloxazines are among the most promising candidates as catalyst for such purposes, the use of them for laboratorial as well as industrial synthetic chemistry has so far been quite limited presumably due to the lack of their preparation methods readily, safely, and inexpensively available. In
with an efficientcatalytic activity. In fact, the isoalloxazinium triflate 1b is an excellent organocatalyst for the chemoselective oxidations of a sulfide to a sulfoxide, Bayer–Villiger reaction of a cyclobutanone to a γ-butyrolactone, Dakin reaction of an arylaldehyde to a phenol, and oxidation of an aldehyde to a carboxylic acid using aq H2O2 as a terminal oxidant undermildconditions.
为了设计更实用,更安全的可替代传统高氯酸盐的黄酮盐催化剂,研究了5-乙基异all嗪鎓盐对硫化氢与H 2 O 2氧化的阴离子活性。发现形成更强共轭酸的阴离子可加速催化的硫氧化反应。核黄素衍生的三氟甲磺酸异别恶嗪鎓盐被选为易于获得的黄素,具有有效的催化活性。实际上,异氟甲磺酸三氟甲磺酸盐1b是出色的有机催化剂,可用于硫化物化学选择性氧化为亚砜,环丁酮向γ-丁内酯的Bayer-Villiger反应,芳基醛向苯酚的Dakin反应以及使用H 2 H 2将醛氧化为羧酸O 2在温和条件下作为末端氧化剂。
1H,2H,19F,14N ENDOR and TRIPLE resonance investigations of substituted flavin radicals in their different protonation states
作者:E. Weilbacher、N. Helle、M. Elsner、H. Kurreck、F. Müller、R. D. Allendoerfer
DOI:10.1002/mrc.1260260115
日期:1988.1
corresponding radical states. Cation and neutral radicals were generated chemically and anionradicals were obtained electrochemically. By performing ENDOR and TRIPLE resonance experiments, complete sets of hyperfine coupling constants including their signs were accessible. The hyperfine data allowed (a) identification of the radical state present, (b) information to be obtained about the preferred conformational