通过将氢原子转移和无痕导向策略与 SR 作为瞬态基团相结合,实现了第一次 Cu 催化的丰富末端炔烃的 1,2,5-三官能化,以中等至优异的产率提供高度官能化的醛,具有广泛的底物范围。该方法的合成效用通过克级反应和所得产物的下游转化得到证明。鉴于在单个反应中高效安装三种不同的官能团,它可以作为一种非常有吸引力的方法,用于从容易获得的起始材料快速组装复杂分子。
A heterogeneous copper-catalyzed direct oxidative cross-dehydrogenativecoupling of terminalalkynes with thiols was achieved in DMSO at 70 °C in the presence of an MCM-41-supported bidentate nitrogen copper(I) complex [MCM-41-2N-CuCl] and K2CO3 under an atmosphere of O2, yielding selectively a variety of alkynyl sulfides in good to excellent yields. This heterogeneous copper catalyst can be easily
在MSO-41负载的双齿氮铜(I)络合物[MCM-41-2N-CuCl]的存在下,在DMSO中于70°C的条件下,末端炔烃与硫醇的异质铜催化直接氧化交叉脱氢偶联反应和在O 2气氛下的K 2 CO 3,以良好至优异的产率选择性地产生各种炔基硫化物。该多相铜催化剂可通过简单的过滤容易地回收并循环10次而活性没有降低。
Photocatalytic Remote Oxyfluoroalkylation of Heteroalkynes: Regio-, Stereo-, and Site-Selective Access to Complex Fluoroalkylated (<i>Z</i>)-Alkenes
A visible-light-induced remote oxyfluoroalkylation, including ketofluoroalkylation and hydroxytrifluoromethylation, of heteroalkynes is developed with dimethylsulfoxide (DMSO) and H2O as the oxygen source, respectively. It provides a facile access to complex fluoroalkylated (Z)-alkenes in satisfactory yields with excellent regio-, stereo-, and site-selectivity. The reaction involves an uncommon vinyl
Ligandless Copper-Catalyzed Carboborylation of Heteroatom-Substituted Alkynes
作者:Shiwen Liu、Xiaojun Zeng、Bo Xu
DOI:10.1002/adsc.201800656
日期:2018.9.3
We have developed an efficient ligand‐free copper‐catalyzed regio‐ and stereoselective carbo‐borylation of heteroatom‐substituted internal alkynes using bis(pinacolato)diboron as boron source and alkyl halides as an electrophile. Both chemical yields and functional group tolerance are excellent. Our method provides an efficient synthesis of tri‐ and tetra‐substituted alkenylboronates which could be
Highly dispersed nano‐copper catalyst on porous polyvinyl chloride for highly regioselective borylation of alkynes
作者:Wenna Xie、Shiwen Liu
DOI:10.1002/aoc.6951
日期:2023.1
developed a highlyregioselective synthesis of multi-substituted alkenylboronates via a heterogeneous ligand-free nano-copper catalyst that was highlydispersed and supported on the porouspolyvinylchloride. In this catalytic system, substituents on the terminal alkynes could affect the configuration of products. Terminal alkynes and general internal alkynes gave β-selective borylation products, whereas
A novel alpha,alpha'-azobis(isobutyronitrile) (AIBN)-induced remote trifluoromethyl-alkynylation of thioalkynes with alkynyl triflones as both the trifluoromethyl and alkyne sources is described. Structurally diverse trifluoromethylated (Z)-enynes can be constructed with full control of regio-, stereo-, and site-selectivity, which serves as a highly selective method for the rapid construction of trifluoromethylated molecules.