Tribromoisocyanuric Acid: A New Reagent for Regioselective Cobromination of Alkenes
作者:Pierre Esteves、Marcio de Mattos、Leonardo de Almeida
DOI:10.1055/s-2006-941601
日期:2006.6
A simple one-step method for the preparation of tribromoisocyanuric acid in good yield (87%) has been developed. The reaction of tribromoisocyanuric acid with alkenes in presence of nucleophilic solvents (MeOH, i-PrOH, AcOH and a mixture of H2O-acetone, 1:5) led to the corresponding β-bromoethers, β-bromoacetates and bromohydrins, in high regioselectivity and good yields (73-98%).
Alkene, Bromide, and ROH – How To Achieve Selectivity? Electrochemical Synthesis of Bromohydrins and Their Ethers
作者:Oleg V. Bityukov、Vera A. Vil'、Gennady I. Nikishin、Alexander O. Terent'ev
DOI:10.1002/adsc.202100161
日期:2021.6.21
Bromohydrins and their ethers were electrochemically synthesized via hydroxy- and alkoxybromination of alkenes using potassium bromide and water or alcohols. High selectivity of bromohydrins formation was achieved only with the use of DMSO as the solvent and an acid as the additive. The proposed combination of starting reagents, additives, and solvents allowed to form bromohydrins or their ethers selectively
BNBTS More than Brominating Agent: Green and One-pot Route for the C-N Bond Formation in Water from Alkenes
作者:Foad Kazemi、Mazaher Abdollahi Kakroudi
DOI:10.5012/bkcs.2013.34.2.500
日期:2013.2.20
In this paper, in addition to introducing efficient method for bromohydrin and bromoether preparation, simple, green and efficient method to C-N bond formation from alkene and N,N'-Dibromo-N,N'-1,2-ethanediyl-bis(p-toluenesulfonamide) [BNBTS] in water was investigated. The reaction between alkenes, $\beta}$-cyclodexterin, and BNBTS took place in water afterward, by making media basic; it will give the corresponding valuable building blocks in good yields (45-79%).
A mild, efficient, and highly regio- and stereoselective method for the methoxy and ethoxy bromination of olefins has been developed using NH4Br as a bromine source and Oxone as an oxidant. Various kinds of olefins (aromatic, linear, and cyclic olefins) afforded the corresponding alkoxy brominated products in moderate to excellent yields. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resources: Full experimental and spectral details.]
Selective electrochemical bromoalkoxylation of aryl olefins