Directed Nickel-Catalyzed Diastereoselective Reductive Difunctionalization of Alkenyl Amines
作者:Lei Zhao、Xiao Meng、Yifeng Zou、Junsong Zhao、Lili Wang、Lanlan Zhang、Chao Wang
DOI:10.1021/acs.orglett.1c03210
日期:2021.11.5
directing group screening to enable olefin difunctionalization with high levels of regio-, chemo-, and diastereocontrol. This general and practical protocol is compatible with α- or β-substituted terminal alkenes and internalalkenes, providing rapid access to branched aliphatic amines bearing two skipped and vicinal stereocenters with high diastereoselectivities that would otherwise be difficult to synthesize
Reaction of 2,3-Dihalopropionic Acids and Their Derivatives with P- and N-Nucleophiles
作者:R. Dzh. Khachikyan、N. V. Tovmasyan、M. G. Indzhikyan
DOI:10.1007/s11176-006-0009-z
日期:2005.12
3-(Triphenylphosphoniochlorido)acrylic and 2,3-dichloropropionic acids react with triphenylphosphine to form 1,2-bis(triphenylphosphoniochlorido)ethane. Under analogous conditions, 2,3-dibromopropionic acid undergoes debromination followed by triphenylphosphine addition to give, after water treatment, 3-(triphenylphosphoniobromido)propionic acid. 2,3-Dihalopropionitriles react similarly, providing 3-(triphenylphosphoniohalido) propionitriles. The reaction of 2,3-dibromopropionamide with triphenylphosphine was performed to show that E-(triphenylphosphoniobromido)acrylic acid is capable, by contrast to what was reported previously, of reacting with triphenylphosphine. Pyridine forms with 2,3-dihalopropionic acids vinylpyridinium halides, while the reactions with aliphatic amines gives rise to dehydrohalogenation products.
Reaction of amides of 2,3-dibromopropionic and 2-bromoacrylic acids with pyridine and triphenylphosphine
作者:R. Dzh. Khachikyan、N. V. Tovmasyan、M. G. Indzhikyan
DOI:10.1134/s1070363209040148
日期:2009.4
latter is inert toward the second molecule of pyridine under the used conditions. Compound I was found to react with triphenylphosphine to form a mixture of 3-triphenylphosphoniumbromidopropionitrile II and 1-triphenylphosphoniumbromido-2-pyridiniumbromidoethane III. Schemes of reactions were suggested involving attack of phosphine on the carbonyl group as the first stage. The reaction of α-bromoacrylic
Spectral study of phosphonium salts synthesized from Michael acceptors
作者:Elleuch Haitham、Ferid Yaccoubi
DOI:10.1080/10426507.2022.2150854
日期:——
Abstract The synthesis of new phosphonium salts derived from Michael acceptors via a one-pot reaction process and the study of their NMR characteristics is described. The simple and rapid 1,4 addition of triphenylphosphine to the Michael acceptors in the presence of HBr (48%) (5 equivalents) was carried out at room temperature to give the corresponding phosphonium salts with excellent yields.
Quinolinamide-Enabled Nickel-Catalyzed Regio- and Diastereoselective γ,δ-Arylalkylation of Nonactivated Alkenes
作者:Chao Wang、Lanlan Zhang、Lei Zhao、Yuqin Zhu
DOI:10.1055/a-2192-7085
日期:——
cleavable quinolinamide directing group facilitates the stabilization of a five-membered nickelacycle, and enables the dicarbofunctionalization of nonactivated alkenes with excellently regio-, chemo-, and diastereoselectivity. The reaction with internal alkenes proceeds stereospecifically to provide valuable γ-alkyl-δ-aryl-substituted amines with two vicinal stereocenters. The scope of substrates and the