Bromo-substituted phenols were obtained quantitatively by passing a solution of phenols in dichloromethane–methanol through a column packed with styrene polymer-bound benzyltrimethylammonium tribromide.
(TsNBr2) has been found to be a new reagent for bromination of aromaticcompounds. The reaction is extremely fast and goes into completion instantaneously at ambient temperature to produce exclusively the corresponding polybrominated product. This procedure is applicable to various phenols, anisole, and anilines to give corresponding polybrominated compound as a single product in excellent yield. GRAPHICAL
Synthesis of Hydroxylated and Methoxylated Polybrominated Diphenyl Ethers − Natural Products and Potential Polybrominated Diphenyl Ether Metabolites
作者:Göran Marsh、Roland Stenutz、Åke Bergman
DOI:10.1002/ejoc.200300081
日期:2003.7
Hydroxylated and methoxylated polybrominated diphenyl ethers (OH-PBDEs and MeO-PBDEs) may be natural products or they may be formed as metabolites of polybrominated diphenyl ethers (PBDEs), frequently used as flame retardants. The aim of this work was to synthesize authentic OH- and MeO-PBDE reference standards for analytical and toxicological studies. Brominated phenoxybenzaldehydes were prepared
Vanadate-dependent bromoperoxidases from Ascophyllum nodosum in the synthesis of brominated phenols and pyrroles
作者:Diana Wischang、Madlen Radlow、Jens Hartung
DOI:10.1039/c3dt51582f
日期:——
aqueous tert-butanol (pH 6.2) molecular bromine as reagent for electrophilic hydrocarbon bromination. Alternative compounds, such as tribromide and hypobromous acid are not sufficiently electrophilic for being directly involved in carbon–bromine bond formation. A decrease in electrophilicity from bromine via hypobromous acid to tribromide correlates in a frontier molecular orbital (FMO) analysis with
An Aryne-Based Route to Substituted Benzoisothiazoles
作者:Yiding Chen、Michael C. Willis
DOI:10.1021/acs.orglett.5b02347
日期:2015.10.2
The combination of arynes, generated using fluoride from the corresponding 2-(trimethylsilyl)aryl triflates, and 3-hydroxy-4-aminothiadiazoles leads to the selective formation of 3-amino-substituted benzo[d]isothiazoles. Variation of the substitution pattern of the aryne precursor, and of the thiadiazole, is possible, with the target heterocycles being obtained in good to excellent yields. In all cases
使用由相应的2-(三甲基甲硅烷基)芳基三氟甲磺酸酯氟化物生成的芳烃与3-羟基-4-氨基噻二唑的组合导致选择性地形成3-氨基取代的苯并[ d ]异噻唑。可以改变芳烃前体和噻二唑的取代方式,并以高至优异的产率获得目标杂环。在所有情况下,使用3-羟基-4-氨基噻二唑都会在产物杂环中引入氨基取代基。