Palladium-Catalyzed Peripheral Arylation of 5-Pyrazolones via Enolizable Bond Protection
作者:Yun Bae、Kee-In Lee、Hye-Rin Bin、Guncheol Kim
DOI:10.1055/s-0030-1260018
日期:2011.6
Peripheral cross-coupling of the enol form of the 5-pyrazolone scaffold with arylboronic acids promoted by [PdCl2(dppf)] afforded the arylated products in good yields. In this coupling, the protection of the enolizable hydroxyl group of pyrazolone is a prerequisite for ensuring the Suzuki-Miyaura cross-coupling. A particular feature of this process is that it enables the synthesis of 5-hydroxy-3-biphenyl