Substitution reactions of secondary halides and epoxides with higher order, mixed organocuprates, R2Cu(CN)Li2: synthetic, stereochemical, and mechanistic aspects
A practical and greener method of the cross-coupling of vinylethylene carbonates (VECs) with arylboronicacids has been described. The coupling reaction was catalyzed by in situ generated palladium nanoparticles (PdNPs) without any ligands and additional stabilizers in water under ambient conditions to provide useful 4-hydroxylprenylarenes and their derivatives in good to high yields.
Palladium catalyzed coupling of organostannanes with vinyl epoxides
作者:David R. Tueting、Antonio M. Echavarren、J.K. Stille
DOI:10.1016/0040-4020(89)80010-9
日期:1989.1
The coupling reaction of organotin reagents with vinyl epoxides, catalyzed by palladium, takes place at ambient temperatures, regioselectively, giving predominately the 1,4-addition product. Both aryl- and vinylstannanes undergo coupling in high yields, while acetylenic, allylic and benzylic tin reagents either give low yields or fail to couple. Although the double bond geometry in the vinylstannane
COPPER (I)-CATALYZED REACTION OF ISOPRENE BROMOHYDRIN WITH ORGANOLITHIUM REAGENT
作者:Shuki Araki、Yasuo Butsugan
DOI:10.1246/cl.1980.185
日期:1980.2.5
The reaction of isoprene bromohydrin (1-bromo-2-methyl-3-buten-2-ol) (1) with ethyl-, propyl- and butyllithium in the presence of copper (I) iodide leads to the exclusive formation of the vinyl group migrated 2-alkyl-4-penten-2-ols (3d–3f), in contrast to the reaction with methyl-, phenyl- and benzyllithium, which yields the corresponding 2-methyl-4-substituted-2-buten-l-ols (2a–2c).
Tosylated lithium 2-(lithiomethyl)-2-propen-1-olate: a γ-alkoxide allyl sulfone anion in organic synthesis
作者:Diego A. Alonso、Carmen Nájera、José M. Sansano
DOI:10.1016/s0040-4020(01)89690-3
日期:——
Dilithiated 2-(tosylmethyl)-2-propen-1-ol (6) functioned as a nucleophile at the α-position of the allylic anion in reactions with deuterium oxide, alkyl halides, and aldehydes, and in conjugate additions to α,β-unsaturated carbonyl compounds. With nitro-olefins conjugate addition occurred at the γ-position of the allylic anion. The hydroxy ester derived by reaction with tert-butyl bromoacetate was
Transition-metal-catalyzed Grignard Reaction of Isoprene Bromohydrin
作者:Shuki Araki、Masayuki Ohmura、Yasuo Butsugan
DOI:10.1246/bcsj.58.1607
日期:1985.5
The coupling reaction of isoprene bromohydrin with aryl and alkyl Grignard reagents catalyzed by tetrakis(triphenylphosphine)palladium(0) selectively gave the vinyl-group-migrated products.