α-Phosphonovinyl Arylsulfonates: An Attractive Partner for the Synthesis of α-Substituted Vinylphosphonates through Palladium-Catalyzed Suzuki Reactions
A new and attractive coupling partner for the synthesis of α‐substituted vinylphosphonates through Suzuki reactions has been developed. The developed O‐centered electrophiles couple with various organoboron reagents to give α‐substituted vinylphosphonates in moderate to excellent yields. This protocol features broad substrate scope, mild conditions, and high efficiency.
Hydrophosphorylation of Alkynes Catalyzed by Palladium: Generality and Mechanism
作者:Tieqiao Chen、Chang-Qiu Zhao、Li-Biao Han
DOI:10.1021/jacs.8b00550
日期:2018.2.28
H-phosphonates disfavored the addition. For H-phosphinates and secondary phosphine oxides, Pd/dppe/Ph2P(O)OH was the catalyst of choice, which led to highly regioselective formation of the Markovnikov adducts. By using Pd(PPh3)4 as the catalyst, hypophosphinic acid added to terminal alkynes to give the corresponding Markovnikov adducts. Phosphinic acids, phosphonic acid, and its monoester were not applicable
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
Acid-Free Nickel Catalyst for Stereo- and Regioselective Hydrophosphorylation of Alkynes: Synthetic Procedure and Combined Experimental and Theoretical Mechanistic Study
作者:Valentine P. Ananikov、Levon L. Khemchyan、Irina P. Beletskaya、Zoya A. Starikova
DOI:10.1002/adsc.201000606
日期:2010.11.22
situ from nickel bis(acetylacetonate) [Ni(acac)2] precursor and bis(diphenylphosphino)ethane (DPPE) ligand has shown excellent performance in the hydrophosphorylation of alkynes. Markovnikov-type regioselective addition to terminal alkynes and stereoselective addition to internal alkynes were carried out with high selectivity without an acidic co-catalyst (in contrast to the palladium/acid catalytic system)
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