Porphyrins as Photoredox Catalysts: Experimental and Theoretical Studies
作者:Katarzyna Rybicka-Jasińska、Wenqian Shan、Katarzyna Zawada、Karl M. Kadish、Dorota Gryko
DOI:10.1021/jacs.6b09036
日期:2016.11.30
only are vital in biological systems but also are valuable catalysts in organic synthesis. On the other hand, catalytic properties of free base porphyrins have been less explored. They are mostly known as efficient photosensitizers for the generation of singlet oxygen via photoinduced energytransfer processes, but under light irradiation, they can also participate in electrontransfer processes. Indeed
Methylene blue catalyzes the visible light-induced organocatalytic α-oxyamination of aldehydes via enamines. The irradiation of 3-phenylpropanal with TEMPO radical in the presence of morpholine as an organocatalyst and methylene blue as a photoredox catalyst gave the desired α-functionalized aldehyde in 75% yield.
亚甲蓝通过烯胺催化可见光诱导的醛的有机催化 α-氧胺化。在作为有机催化剂的吗啉和作为光氧化还原催化剂的亚甲蓝存在下,用 TEMPO 自由基对 3-苯基丙醛进行辐照,以 75% 的产率得到所需的 α-官能化醛。
Asymmetric α-oxyamination of aldehydes by synergistic catalysis of imidazolethiones and metal salts
作者:Xianrui Liang、Na Li、Xinlei Chen、Weike Su
DOI:10.1039/c4ra08556f
日期:——
Novel and efficient imidazolethione catalysts combined with metal salts were successfully introduced to the asymmetric α-oxyamination of aldehydes. The desired products with high yields and good to excellent enantioselectivities were obtained via a one-pot oxidation–oxyamination reaction system.
Peptide/Laccase Cocatalyzed Asymmetric α-Oxyamination of Aldehydes
作者:Kengo Akagawa、Kazuaki Kudo
DOI:10.1021/ol2012956
日期:2011.7.1
An asymmetric α-oxyamination could be successfully performed by a peptide catalyst and laccase. The combination of peptide catalysis and enzymatic air oxidation promoted the reaction smoothly in water without employing a metal reagent. The oxyaminated compounds could be obtained as both aldehyde and carboxylic acid products depending on the reaction conditions.
An efficient tandem reaction system was developed, in which primary alcohols were used for the oxidation to the corresponding aldehydes followed by an asymmetric alpha-oxyamination with a resin-supportedpeptidecatalyst.