The first palladium‐catalyzed method for the arylation of α‐phosphonovinyl nonaflates is described. Using a catalyst comprised of Pd(OAc)2 and SPhos, terminal and internal α‐aryl vinylphosphonates could be efficiently accessed under mild conditions. The reaction features a broad coupling partner scope and tolerates many functional groups.
Pd-Catalysed Suzuki coupling of α-bromoethenylphosphonates with organotrifluoroborates: a general protocol for the synthesis of terminal α-substituted vinylphosphonates
and robust protocol for the synthesis of terminal α-substituted vinylphosphonates via Suzuki coupling of α-bromovinylphosphonates with organotrifluoroborates has been successfully developed. This method features broad substrate scope, great functional group compatibilities, and easy scale-up ability. In addition to easy access of nucleophiles, straightforwardsynthesis of electrophiles was also realized
A Simple and Efficient Method for One-Pot, Three-Component Synthesis of Terminal Vinylphosphonates Using a Task-Specific Ionic Liquid
作者:Sara Sobhani、Moones Honarmand
DOI:10.1055/s-0032-1317965
日期:——
convenient and practical method for the one-pot, three-componentsynthesis of terminal vinylphosphonates from readily available starting materials (aryl/alkyl/heteroaryl aldehydes, nitromethane and trialkylphosphites) through a tandem Henry–Michael reaction followed by nitro elimination in the presence of 5-hydroxypentylammonium acetate (5-HPAA) as a task-specific ionicliquid, is described. This method offers
A Palladium-Catalyzed Decarboxylative Heck-Type Reaction of Disubstituted Vinylphosphonates in the Stereoselective Synthesis of Trisubstituted Vinylphosphonates
作者:Linjing Ren、Maogang Ran、Jiaxin He、Dan Xiang、Feng Chen、Peijun Liu、Chunyang He、Qiuli Yao
DOI:10.1002/ejoc.201900810
日期:2019.9.8
We describe a highly stereoselective and atomically economical approach for the preparation of trisubstituted vinylphosphonates through palladium‐catalyzed decarboxylative Heck‐type reactions of vinylphosphonates. Excellent E/Z selectivity was achieved mostly with E‐isomers with oxygen in the air was the sole oxidant; this was difficult to achieve via traditional methods. This work is the first example
hydrotrifluoromethylation of vinyl phosphonates or phosphineoxides by sodium triflinate under ultraviolet or visible light irradiation is reported. Acetone and diacetyl are used as radical initiators. A broad substrate scope is demonstrated with moderate to excellent yields. Mechanistic experiments indicate that traces of H2O in the solvent or additive act as the primary hydrogen source.