Oxidative Fragmentations and Skeletal Rearrangements of Oxindole Derivatives
作者:Hendrik F. T. Klare、Alexander F. G. Goldberg、Douglas C. Duquette、Brian M. Stoltz
DOI:10.1021/acs.orglett.6b03789
日期:2017.3.3
An oxidative sequence for the conversion of oxindoles to structurally distinct heterocyclic scaffolds and aniline derivatives is disclosed by the combination of a copper-catalyzed C–H peroxidation and subsequent base-mediated fragmentation reaction. In contrast to classic enzymatic (i.e., kynurenine pathway) and biomimetic methods (i.e., Witkop–Winterfeldt oxidation) for oxidative indole cleavage,
Pyridazine <i>N</i>-Oxides as Photoactivatable Surrogates for Reactive Oxygen Species
作者:Vitalii S. Basistyi、James H. Frederich
DOI:10.1021/acs.orglett.2c00227
日期:2022.3.18
evolution of atomic oxygen from pyridazineN-oxides was developed. This underexplored oxygen allotrope mediates arene C–H oxidation within complex, polyfunctional molecules. A water-soluble pyridazineN-oxide was also developed and shown to promote photoinduced DNA cleavage in aqueous solution. Taken together, these studies highlight the utility of pyridazineN-oxides as photoactivatable O(3P) precursors
开发了一种从哒嗪N-氧化物光诱导析出原子氧的方法。这种尚未开发的氧同素异形体介导复杂的多功能分子内的芳烃 C-H 氧化。还开发了一种水溶性哒嗪N-氧化物,并显示其可促进水溶液中的光诱导 DNA 裂解。总而言之,这些研究强调了哒嗪N-氧化物作为可光活化的 O( 3 P) 前体在有机合成和化学生物学中的应用。
A New and Efficient Synthesis of Unnatural Amino Acids and Peptides by Selective 3,3-Dimethyldioxirane Side-Chain Oxidation
N-Boc derivatives of Leu, Met, Thr, Trp, and Pro, the properties of which resemble those of the respective alpha-amino acid residues present in proteins, rapidly oxidize in the presence of 3,3-dimethyldioxirane to give different products depending on the structure of the oxidizable group in the side chain. A high regioselectivity for the oxygen atom insertion into the gamma-CH bond of Leu residues with respect to the weaker alpha-CH bond was observed. A position selectivity in the oxidation of peptides containing more than one Leu residue was also found.
A novel oxidative side-chain transformation of α-amino acids and peptides by methyltrioxorhenium/H2O2 system
作者:Francesco Lazzaro、Marcello Crucianelli、Francesco De Angelis、Veronica Neri、Raffaele Saladino
DOI:10.1016/j.tetlet.2004.10.074
日期:2004.12
N-Boc derivatives of Met, Cys, and Trp, the properties of which resemble those of the respective amino acid residues present in proteins, are efficiently oxidized by methyltrioxorhenium and H2O2. A high regioselectivity for the oxidation of these residues when embedded into peptides was also found. (C) 2004 Elsevier Ltd. All rights reserved.