Synthesis of Terminal Allenes through Copper-Mediated Cross-Coupling of Ethyne withN-Tosylhydrazones or α-Diazoesters
摘要:
Ethyne is employed as coupling partner in copper-mediated cross-coupling reactions with N-tosylhydrazones and alpha-diazoacetate, leading to the development of a new synthetic method for terminal allenes. With this novel coupling method, the terminal allenes were obtained in good yields and with excellent functional group tolerance. Copper carbene migratory insertion is proposed as the key step in these transformations.
Ligand‐free Palladium‐Catalyzed Carbonylative Suzuki Coupling of Aryl Iodides in Aqueous CH
<sub>3</sub>
CN with Sub‐stoichiometric Amount of Mo(CO)
<sub>6</sub>
as CO Source
作者:Nan Sun、Qingxia Sun、Wei Zhao、Liqun Jin、Baoxiang Hu、Zhenlu Shen、Xinquan Hu
DOI:10.1002/adsc.201900011
日期:2019.4.23
established based on the palladium‐catalyzed carbonylative Suzuki coupling approach with sub‐stoichiometric Mo(CO)6 as CO source. Using 0.5 mol% of Pd(TFA)2 as catalyst, 0.5 equivalent of Mo(CO)6 as solid carbonyl reagent and 3 equivalent of K3PO4 as base, a wide range of functionalized (hetero)aryl iodides and (hetero)aryl boronic acids could smoothly proceed the carbonylative cross‐coupling reaction in aqueous
基于亚化学计量的Mo(CO)6作为CO源的钯催化羰基化Suzuki偶联方法,已经建立了一种合成二芳基和杂二芳基酮的新方法。使用0.5摩尔%的Pd(TFA)2作为催化剂,0.5当量的Mo(CO)6作为固体羰基试剂和3当量的K 3 PO 4作为碱,各种官能化的(杂)芳基碘和(杂)芳基硼酸可以在50°C的CH 3 CN水溶液中平稳地进行羰基交叉偶联反应,从而提供相应的酮,收率非常好。新开发的方法易于在温和条件下高效地操作。