Late‐stage Pd‐catalyzed Cyanations of Aryl/Heteroaryl Halides in Aqueous Micellar Media
作者:Ruchita R. Thakore、Balaram S. Takale、Vani Singhania、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1002/cctc.202001742
日期:2021.1.12
New technology is described that enables late stage ppm Pd‐catalyzed cyanations of highly complex molecules, as well as a wide variety of aryl and heteroaryl halides possessing sensitive functional groups. These reactions are efficient in water containing nanomicelles, formed from a commercially available and inexpensive surfactant. The implications for advancing drug synthesis and discovery are apparent
Heterocyclic alkylaminocarbonylsulfonamides, such as N'-[(4,6-dimethylpyrimidin-2-yl)methylaminocarbonyl]-N,N-dimethyl-1,2-benz enedisulfonamide, are useful as herbicides.
Verfahren zur Herstellung von 2,4,6-Tricyano-1,3,5-triazin
申请人:BAYER AG
公开号:EP0436915A2
公开(公告)日:1991-07-17
Das erfindungsgemäße Verfahren zur Herstellung von 2,4,6-Tricyano-1,3,5-triazin besteht darin, 2,4,6-Trihalogen-1,3,5-triazine der Formel
in der
Hal₁ und Hal₂unabhängig voneinander für Chlor oder Fluor stehen,
mit Alkali- oder Erdalkalicyaniden umzusetzen.
Immobilized palladium nanoparticles on a cyclodextrin-polyurethane nanosponge (Pd-CD-PU-NS): An efficient catalyst for cyanation reaction in aqueous media
Immobilized palladium nanoparticles on a cyclodextrin-polyurethane nanosponge (Pd-CD-PU-NS) were found to be an efficient heterogeneous catalyst in the cyanation reaction of aryl halides in aqueous media. This catalyst system is containing palladium nanoparticles with a size of similar to 7 nm. Moreover, the CD-PU-NS support formed microsphere-shaped structures with a size of similar to 100-200 nm. The TEM images show that Pd nanoparticles were formed in near spherical shape morphology and were immobilized in the structure of the CD-PU-NS support. Under our optimized reaction conditions, aryl cyanides were obtained in high yields in the presence of the Pd-CD-PU-NS catalyst. Our results demonstrated that the Pd-CD-PU-NS catalyst is highly effective in the cyanation reaction in aqueous media. Furthermore, the catalyst could be simply extracted from the reaction mixture, providing an efficient methodology for the synthesis of aryl cyanides. The Pd-CD-PU-NS catalyst could be recycled four times with almost consistent catalytic efficiency.