34801-09-7Relevant articles and documents
Peters,Johnson
, p. 1517 (1975)
Proximity Histidine Labeling by Umpolung Strategy Using Singlet Oxygen
Nakane, Keita,Sato, Shinichi,Niwa, Tatsuya,Tsushima, Michihiko,Tomoshige, Shusuke,Taguchi, Hideki,Ishikawa, Minoru,Nakamura, Hiroyuki
supporting information, p. 7726 - 7731 (2021/05/29)
While electrophilic reagents for histidine labeling have been developed, we report an umpolung strategy for histidine functionalization. A nucleophilic small molecule, 1-methyl-4-arylurazole, selectively labeled histidine under singlet oxygen (1O2) generation conditions. Rapid histidine labeling can be applied for instant protein labeling. Utilizing the short diffusion distance of 1O2 and a technique to localize the 1O2 generator, a photocatalyst in close proximity to the ligand-binding site, we demonstrated antibody Fc-selective labeling on magnetic beads functionalized with a ruthenium photocatalyst and Fc ligand, ApA. Three histidine residues located around the ApA binding site were identified as labeling sites by liquid chromatography-mass spectrometry analysis. This result suggests that 1O2-mediated histidine labeling can be applied to a proximity labeling reaction on the nanometer scale.
Method for preparing O-phenylenediamine from aniline
-
, (2020/06/17)
The invention provides a method for preparing o-phenylenediamine from aniline. The method comprises the following steps: protecting an amino group on aniline by using an acetyl group, then mixing withan amino donor, an oxidant and a catalyst Pd-Cu/TS-1 to carry out an ammoniation reaction, carrying out deprotection, and separating to obtain o-phenylenediamine. A protecting group strategy is used,the acetyl group is adopted to protect the amino group on aniline, the catalyst is coordinated with a carbonyl group in acetanilide to induce and activate the o-position C-H bond, so the o-position selectivity is improved, the generation of byproducts is reduced, the ammoniation efficiency and selectivity can be greatly improved, and the yield and purity of o-phenylenediamine are improved; and the o-phenylenediamine is directly prepared from aniline, so the environmental pollution caused by nitrification and chlorination processes is avoided, and the method is more in line with the green andenvironment-friendly synthesis concept.