Palladium-Catalyzed Allyl Cross-Coupling Reactions with In Situ Generated Organoindium Reagents
作者:Kooyeon Lee、Hyunseok Kim、Juntae Mo、Phil Ho Lee
DOI:10.1002/asia.201000890
日期:2011.8.1
compounds may be effective nucleophilic coupling partners in palladium‐catalyzed cross‐coupling reactions. A variety of allyl halides, such as allyl iodide, allyl bromide, crotyl bromide, prenyl bromide, geranyl bromide, and 3‐bromocyclohexene afforded the allylic cross‐coupling products in good to excellent yields. Stereochemistry of the double bond is retained in the allylic cross‐coupling reactions
A new bench stable reagent that is easily synthesized and handled is investigated for its use in radical prenylation of diverse organic molecules. It has demonstrated high functional group compatibility and can be used with numerous photocatalytic methods to give prenylated products from aryl iodides, bromides, anilines, thiols and alkyl halides.
and -stannane, the photosubstitution occurred at both α- and γ-positions of the allylic moiety in a constant ratio, regardless of the kinds of metals. 1,3-Dicyanobenzene (m-DCB) was less reactive to the photosubstitutionreaction. The reactivity of group 14 organometallic compounds increased in the order: Si- < Ge- < Sn-compounds. The photoreactions were sensitized by aromatic hydrocarbons such as
Photosubstitution of Dicyanobenzenes by Group 14 Organometallic Compounds via Photoinduced Electron-Transfer. Additive and Medium Effects on Photoinduced Electron Transfer Reaction
The phenanthrene-sensitized photoreaction of 1,2- and 1,4-dicyanobenzenes with group14organometallic compounds containing allylic and benzylic groups in CH3CN afforded the corresponding 2- and 4-allylated and -benzylated benzonitriles in high yields. These photoreactions were accelerated by the addition of Mg(CLO4)2 and benzene derivatives.