Palladium-Catalyzed Disilylation and Digermanylation of Alkene Tethered Aryl Halides: Direct Access to Versatile Silylated and Germanylated Heterocycles
作者:Marco Wollenburg、Jonathan Bajohr、Austin D. Marchese、Andrew Whyte、Frank Glorius、Mark Lautens
DOI:10.1021/acs.orglett.0c01169
日期:2020.5.1
A method for the palladium-catalyzed disilylation and digermanylation of aryl halides bearing a tethered alkene has been developed. The mechanism is thought to proceed via Heck-type cyclization, followed by C-H activation, resulting in a reactive fused-palladacycle. A wide variety of disilylated and digermanylated heterocycles are obtained from readily available aryl halides in high yields with various
Palladium-Catalyzed Heck-type Domino Cyclization and Carboxylation to Synthesize Carboxylic Acids by Utilizing Chloroform as the Carbon Monoxide Source
作者:Xianglei Liu、Bin Li、Zhenhua Gu
DOI:10.1021/acs.joc.5b01126
日期:2015.8.7
A palladium-catalyzed domino cyclization and carboxylation reaction for synthesis of a variety of carboxylic acids was developed, where chloroform was used as “carbonmonoxide” source. The in situ generated neopentylpalladium species by Heck cyclization was efficiently trapped by dichlorocarbene to form a series of carboxylic acids. It was found that in this type of domino reaction CHCl3 is a convenient
Domino Heck/Hiyama cross-coupling: trapping of the σ-alkylpalladium intermediate with arylsilanes
作者:Xin-Xing Wu、Hao Ye、Guomin Jiang、Lanping Hu
DOI:10.1039/d1ob00595b
日期:——
A palladium-catalyzed domino Heck cyclization/Hiyama coupling reaction by the trapping of the σ-alkylpalladium intermediate with arylsilanes is described. A wide range of aryl-tethered alkenes and arylsilanes are all compatible with the reaction conditions. This approach shows good yields and excellent functional group tolerance, presenting a more practical and sustainable alternative to the conventional