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
A nitrogen-doped porous carbon derived from copper phthalocyanines on/in ZIF-8 as an efficient photocatalyst for the degradation of dyes and the C H activation of formamides
A novel nitrogen doped carbon photocatalyst was successfully prepared from the carbonization of copperphthalocyanine (CuPc) on/in zeolitic imidazolate framework-8 (ZIF-8) hybrid. Carbonized catalysts derived from either ZIF-8 or CuPc exhibit poor activity towards the degradation of dyes (such as methyl orange (MO) and Rhodamine B (Rh B)), whereas carbonized CuPc complex supported on ZIF-8 exhibits
通过在沸石咪唑酸酯骨架8(ZIF-8)杂化物上/中酞菁铜(CuPc)的碳化成功制备了一种新型的氮掺杂碳光催化剂。衍生自ZIF-8或CuPc的碳化催化剂对染料(如甲基橙(MO)和若丹明B(Rh B))的降解表现出较差的活性,而负载在ZIF-8上的碳化CuPc配合物则表现出极高的性能。CuPc / ZIF-8的重量比为1∶2和1∶8显示出高的染料吸收活性,而在存在H 2 O 2作为氧化剂的情况下,重量比为1∶4显示出高的光催化活性。在叔酸存在下,光催化剂(Cu / N -PC)首次用于C H活化甲酰胺丁基过氧化氢(TBHP)作为氧化剂。在0.02mol%的Cu存在下,反应在30分钟内进行。
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.
作者:Dominik Gärtner、André Luiz Stein、Sabine Grupe、Johannes Arp、Axel Jacobi von Wangelin
DOI:10.1002/anie.201504524
日期:2015.9.1
unreactive in cross‐coupling reactions which mostly employ more electrophilic halides or activated esters (triflates, tosylates). Acetates are cheap and easily accessible electrophiles but have not been used in cross‐couplings because the strong CO bond and high propensity to engage in unwanted acetylation and deprotonation. Reported herein is a selective iron‐catalyzedcross‐coupling of diverse alkenyl