Palladium(II)-Catalyzed Direct Arylation of Enaminones Using Organotrifluoroborates
摘要:
A Pd(II)-catalyzed reaction for the direct aryation of cyclic enaminones is reported. The reactivity of electron-rich, electron-poor, and sterically encumbered organotrifluoroborates was investigated. This reaction represents a unique use for organotrifluoroborates as coupling partners and discloses the utility of enaminones for direct-functionalization reactions. It provides immediate access to arylpiperidine, indolizidine, and quinolizidine scaffolds from the corresponding mono- and bicyclic, unattenuated enaminones.
Copper-Assisted Palladium(II)-Catalyzed Direct Arylation of Cyclic Enaminones with Arylboronic Acids
作者:Yong Wook Kim、Micah J. Niphakis、Gunda I. Georg
DOI:10.1021/jo301531k
日期:2012.11.2
Described herein is a palladium(II)-catalyzed direct arylation of cyclic enaminones with arylboronicacids. The versatility of this method is that both electron-rich and electron-poor boronic acids can be coupled in high yields. A mixture of two Cu(II) additives was crucial for efficient cross-coupling. The role of each Cu(II) reagent appears to be distinct and complementary serving to assist catalyst
Palladium-Catalyzed Direct C–H Arylation of Cyclic Enaminones with Aryl Iodides
作者:Yi-Yun Yu、Lei Bi、Gunda I. Georg
DOI:10.1021/jo400830t
日期:2013.6.21
A ligand-free method for the Pd-catalyzed direct arylation of cyclic enaminones using aryl iodides was developed. This method can be applied to a wide range of cyclic enaminones and aryl iodides with excellent C5-regioselectivity. Using widely available aryl iodides, the generality of this transformation provides easy access to a variety of 3-arylpiperidine structural motifs.
Palladium(II)-Catalyzed Direct Arylation of Enaminones Using Organotrifluoroborates
作者:Haibo Ge、Micah J. Niphakis、Gunda I. Georg
DOI:10.1021/ja710221c
日期:2008.3.1
A Pd(II)-catalyzed reaction for the direct aryation of cyclic enaminones is reported. The reactivity of electron-rich, electron-poor, and sterically encumbered organotrifluoroborates was investigated. This reaction represents a unique use for organotrifluoroborates as coupling partners and discloses the utility of enaminones for direct-functionalization reactions. It provides immediate access to arylpiperidine, indolizidine, and quinolizidine scaffolds from the corresponding mono- and bicyclic, unattenuated enaminones.