Photooxidative Cleavage of Aromatic Alkenes into Aldehydes Using Catalytic Iodine and Molecular Oxygen under Visible Light Irradiation
摘要:
We report a method for the photooxidative cleavage of aromatic alkenes to give aldehydes using molecular oxygen as the terminal oxidant, visible light, a catalytic amount of iodine and trifluoroacetic acid.
Catalytic Transfer Hydrogenation Using Biomass as Hydrogen Source
作者:Srimanta Manna、Andrey P. Antonchick
DOI:10.1002/cssc.201801770
日期:2019.7.5
entities in a fundamentally important process, such as hydrogenation. Various carbohydrates, starch, and lignin were used for stereoselective hydrogenation. Employing a transition metal catalyst and a novel catalytic system, the reduction of alkynes, alkenes, and carbonyl groups with high yields was demonstrated. The regioselective hydrogenation to access different stereoisomers was established by simple
A transitionmetal-free domino process has been developed, for the first time, to synthesize (E)-stilbenes, biaryl methanes and biaryl ethers from substituted α,β-unsaturated ketones, benzyl acetones and phenacyl ethers, respectively, in moderate to good yields at roomtemperature using diethyl aluminium chloride (Et2AlCl) as a Lewis acid.
Alkene <i>Syn</i>- and <i>Anti</i>-Oxyamination with Malonoyl Peroxides
作者:Jonathan M. Curle、Marina C. Perieteanu、Philip G. Humphreys、Alan R. Kennedy、Nicholas C. O. Tomkinson
DOI:10.1021/acs.orglett.0c00253
日期:2020.2.21
Malonoyl peroxide 6 is an effective reagent for the syn- or anti-oxyamination of alkenes. Reaction of 6 and an alkene in the presence of O-tert-butyl-N-tosylcarbamate (R3 = CO2tBu) leads to the anti-oxyaminated product in up to 99% yield. Use of O-methyl-N-tosyl carbamate (R3 = CO2Me) as the nitrogen nucleophile followed by treatment of the product with trifluoroacetic acid leads to the syn-oxyaminated
A Novel Catalyst-Free Synthesis of 2,2-Diaryl Enamides from Stilbenes via a Nitrene Transfer Reaction
作者:Yuanyuan Zhang、Wenjing Ye、Hui Zhang、Xiao Xiao
DOI:10.1002/ejoc.201900885
日期:2019.9.8
An unexpected nitrene transfer from iminoiodinane to stilbene in absence of catalyst has been described, directly giving a series of 2,2‐diaryl enamides in 28–75 % yields. This reaction involved aziridination, ring‐opening of aziridine, and aromatic rearrangement, in which iminoiodinane played a dual role.
Selenolate Anion as an Organocatalyst: Reactions and Mechanistic Studies
作者:Oleksandra S. Trofymchuk、Zhipeng Zheng、Takashi Kurogi、Daniel J. Mindiola、Patrick J. Walsh
DOI:10.1002/adsc.201701568
日期:2018.4.17
the selenolate anion [RSe]–, generated from bench‐stable and commercially available diphenyl diselenide or from phenyl benzyl selenide (10 mol%) is introduced. Benchmarking is performed in the conversion of benzylic chlorides into trans‐stilbenes selectively at room temperature. Mechanistic studies support the intermediacy of the selenolate anion and of 1,2‐diphenylethyl phenyl selenide.