catalysed oxidative coupling reaction of formamides with β-keto esters and 2-carbonyl-substituted phenols successfully proceeded through directC–Hbondactivation of formamides. The corresponding carbamates were formed with high stereoselectivity under mild reaction conditions. This protocol was successfully applied to the synthesis of three novel halogenated carbamates and a carbaryl insecticide derivative
Copper-Catalyzed Oxidative CO Coupling by Direct CH Bond Activation of Formamides: Synthesis of Enol Carbamates and 2-Carbonyl-Substituted Phenol Carbamates
Formamide CH bondactivation has been achieved under oxidative conditions, using a copper catalyst and tert‐butyl hydroperoxide (TBHP) as the external oxidant (see scheme). This oxidative coupling of a range of dialkyl formamides provides an easy, phosgene‐free route for the selective synthesis of Z‐enol carbamates and 2‐carbonyl‐substituted phenol carbamates in high yields.
Nickel-catalyzed oxidative esterification of formamides with 1,3-dicarbonyl compounds under mild reaction conditions
作者:Dariush Saberi、Samira Poorsadeghi
DOI:10.1002/aoc.3855
日期:2017.12
Synthesis of enol carbamates was achieved via nickel‐catalyzed oxidative coupling of formamides with 1,3‐dicarbonyl compounds in the presence of tert‐butyl hydroperoxide at 40 °C. Various derivatives of enol carbamates were synthesized by this method in good to excellent yields.
Oxidative coupling of formamides with β-dicarbonyl compounds and the synthesis of 2-aminobenzothiazole using Cu(II)-functionalized Fe3O4 nanoparticles
作者:Kobra Azizi、Meghdad Karimi、Akbar Heydari
DOI:10.1016/j.tetlet.2014.12.110
日期:2015.2
carbamates are synthesized in excellent yields (up to 92%) under the optimized reaction conditions. Fe3O4@EDTA–Cu(II) has the advantage of being magnetically recoverable. Also, we have established a highly efficient Fe3O4@EDTA–Cu(II)-catalyzed tandemreaction of 2-iodoanilines with isothiocyanates for the synthesis of 2-aminobenzothiazoles.
使用叔丁基过氧化氢作为氧化剂,开发了Fe 3 O 4 @ EDTA-Cu(II)纳米颗粒催化甲酰胺与β-二羰基化合物的氧化偶联。通常,在优化的反应条件下,烯醇氨基甲酸酯的合成产率极高(最高可达92%)。Fe 3 O 4 @ EDTA-Cu(II)具有可磁回收的优点。此外,我们已经建立了高效的Fe 3 O 4 @ EDTA-Cu(II)催化2-碘苯胺与异硫氰酸酯的串联反应,用于合成2-氨基苯并噻唑。
Oxidative Coupling of Dimethylformamide with β-Dicarbonyl Compounds Using γ-Fe2O3@CuO Nanoparticles
作者:H. Hassani、F. Shaghayeghi Toosi、N. Feizi
DOI:10.1134/s1070428020090249
日期:2020.9
Abstract Maghemite–copper oxide nanocomposite catalyzed oxidative coupling of formamides with β-dicarbonylcompounds in the presence of tert-butyl hydroperoxide as an oxidant to produce the corresponding enol carbamates in excellent yields (up to 92%) under the optimized conditions. The simple preparation and the ability to be recycled and magnetically separated are salient features of this catalytic