Iron-Catalyzed Ring-Opening Azidation and Allylation of O-Heterocycles
摘要:
We have established the first catalytic C-C and C-N bond formation reactions of O-heterocycles (e.g., tetrahydrofuran, phthalane, and lactone derivatives) using iron bichloride as a catalyst in the presence of TMSN3 or allylsilanes accompanied by the ring opening of O-heterocycles. The reactions smoothly proceeded at room temperature to give the corresponding primary saturated alcohols from the 2-substituted tetrahydrofurans, ortho-substituted benzyl alcohols from phthalanes, and saturated carboxylic acids from lactones in high yields.
NiCl2-catalyzed radical cross decarboxylative coupling between arylpropiolic acids and cyclic ethers
作者:Zi-juan Wan、Jin-yuan Wang、Jun Luo
DOI:10.1016/j.tetlet.2019.01.039
日期:2019.2
A direct alkenylation of cyclic ethers via radical cross decarboxylative coupling process catalyzed by NiCl2 and using DTBP as radicalinitiator and oxidant was developed. A variety of arylpropiolic acids and cyclic ethers were transformed into the corresponding 2-arylvinyl cyclic ethers in moderate to excellent yields. Mechanistic experiments were conducted to determine the nature of the reaction
shows extraordinary high activity in the decarboxylative coupling of cinnamic acids with alcohols. In addition, the Cu-X catalyst presents excellent performance in the oxidativecoupling of alkenes with aldehydes. The strong interaction between Cu+ and the zeolite framework benefits the transformation of Cu2+ and Cu+ in the redox process, enhancing the reaction activity. More importantly, the Lewis basic
Transition-Metal-Free Oxidative Decarboxylative Cross Coupling of α,β-Unsaturated Carboxylic Acids with Cyclic Ethers under Air Conditions: Mild Synthesis of α-Oxyalkyl Ketones
A novel K2S2O8-promoted decarboxylative cross coupling of α,β-unsaturated carboxylic acids with cyclic ethers was developed under aerobic conditions. The present protocol, which includes C–C and C═O bond formation in one step through addition, oxidation, and decarboxylation processes, leads to the desired ketone products in moderate to excellent yields. In addition, mechanism studies showed that the
在好氧条件下,开发了一种新型的K 2 S 2 O 8促进的α,β-不饱和羧酸与环醚的脱羧交叉偶联。本方案包括通过加成,氧化和脱羧过程一步形成C–C和C═O键,从而以中等至极好的收率得到了所需的酮产物。此外,机制的研究表明,在转化过程经历经由α-SP的直接活化自由基途径3环醚的氧的C-H键。