Copper(II) bromide as an efficient catalyst for the selective protection and deprotection of alcohols as bis(4-methoxyphenyl)methyl ethers
作者:Rofia Mezaache、Yénimégué Albert Dembelé、Yann Bikard、Jean-Marc Weibel、Aurélien Blanc、Patrick Pale
DOI:10.1016/j.tetlet.2009.10.053
日期:2009.12
In a cheap and eco-friendly process, primary and secondary alcohols were easily protected as bis(methoxyphenyl)methyl (BMPM) ethers in good yields using CuBr2 as a catalyst in acetonitrile at room temperature. Deprotection could easily be achieved using the same catalyst but in ethanol. Both Cu-catalyzed protection and deprotection were orthogonal to other methods and fully compatible with other functional
Copper(II) bromide as efficient catalyst for silyl- to bisarylmethyl ethers interconversion (transprotection)
作者:Simon Specklin、Florian Gallier、Rofia Mezaache、Hassina Harkat、Yénimégué Albert Dembelé、Jean-Marc Weibel、Aurélien Blanc、Patrick Pale
DOI:10.1016/j.tetlet.2011.08.148
日期:2011.11
Primary and secondary silylated alcohols are easily converted to bis(methoxyphenyl)methyl (BMPM) ethers in good yields using CuBr2 as catalyst in acetonitrile at room temperature. Various other protecting groups are compatible with this mild and convenient process. (C) 2011 Elsevier Ltd. All rights reserved.
Syntheses of Trifluoroethylated N-Heterocycles from Vinyl Azides and Togni’s Reagent Involving 1,<i>n</i>-Hydrogen-Atom Transfer Reactions
6-dihydro-2H-1,3-oxazines have been obtained by reacting substituted vinyl azides with a combination of Togni’s reagent and substoichiometric amounts of iron(II) chloride. The results of density functional theory calculations support the proposed mechanism involving 1,n-hydrogen-atom transfer reactions.
通过使取代的乙烯基叠氮化物与Togni试剂和亚化学计量的三氯甲烷组合反应,可以得到2,2,2-三氟乙基取代的3-恶唑啉,3-噻唑啉和5,6-二氢-2 H -1,3-恶嗪。氯化铁(II)。密度泛函理论计算的结果支持了所提出的涉及1,n-氢原子转移反应的机理。
Unlocking the reactivity of diazo compounds in red light with the use of photochemical tools
作者:Katarzyna Orłowska、Klaudia Łuczak、Piotr Krajewski、João V. Santiago、Katarzyna Rybicka-Jasińska、Dorota Gryko
DOI:10.1039/d3cc05174a
日期:——
The red light-irradiation of structurally diversified diazoalkanes gives access to reactive intermediates via direct photolysis and via photosensitization or photoredox approaches.