Optimization and Scale-Up of a Suzuki−Miyaura Coupling Reaction: Development of an Efficient Palladium Removal Technique
摘要:
A ligand-solvent-base screen was performed on a Suzuki-Myaura coupling reaction, and the screening data, followed by a set of focused experiments, helped to optimize reaction conditions. Further work was carried out that centered on reducing the level of residual palladium in the isolated product. Treatment of the reaction mixture with toluene and 20% aqueous NaHSO3 at elevated temperature lowered the palladium content from similar to 8000 ppm to 100 ppm or less. The Suzuki-Miyaura coupling and palladium removal process were demonstrated on 20-L scale, are highly efficient and cost-effective, and require short cycle times.
Synthesis of Substituted Indoles from 2-Azidoacrylates and <i>ortho</i>-Silyl Aryltriflates
作者:Deng Hong、Zhengbo Chen、Xufeng Lin、Yanguang Wang
DOI:10.1021/ol101934v
日期:2010.10.15
2-Azidoacrylates react with benzynes in the presence of PPh3 and CsF to afford substituted indoles in good yields. The reaction involves the formation of iminophosphorane and benzyne and a subsequent double cyclization/hydrolysis/air-oxidation cascade. This methodology was utilized to synthesize 10H-indolo[1,2-a]indol-10-ones.