[Pd(PPh3)2(saccharinate)2]—general catalyst for Suzuki–Miyaura, Negishi cross-coupling and C–H bond functionalization of coumaryl and pyrone substrates
作者:Parin Shah、M. Dolores Santana、Joaquín García、J. Luis Serrano、Minal Naik、Suhas Pednekar、Anant R. Kapdi
DOI:10.1016/j.tet.2012.12.030
日期:2013.2
The potential of complex [Pd(PPh3)(2)(saccharinate)(2)] 1 in catalyzing Suzuki-Miyaura cross-coupling of 4-halo and 4-bromomethyl coumaryl and pyrone substrates with different aryl boronic acids has been explored. Excellent yields of the desired products are obtained in competitive reaction time and under relatively mild conditions. Negishi cross-coupling of 4-coumaryl tosylate with aryl and allcylzinc reagents has also been performed with good yields of the cross-coupled products obtained in most cases. Intramolecular C-H bond functionalization of coumaryl ethers also furnished very high yields of synthetically attractive tetracyclic ring systems exhibiting the potential of I as a powerful catalyst in synthetically important reactions. (C) 2012 Elsevier Ltd. All rights reserved.
Palladium-catalyzed direct arylation of 4-hydroxycoumarins with arylboronic acids via C–OH bond activation
作者:Yong Luo、Jie Wu
DOI:10.1016/j.tetlet.2009.02.116
日期:2009.5
Operationally simple PdCl2-Catalyzed direct arylation of 4-hydroxycoumarins with arylboronic acids via C-OH bond activation under mild conditions is described, which gave rise to the corresponding 4-arylcoumarins in good to excellent yields. (c) 2009 Elsevier Ltd. All rights reserved.