Palladium-catalyzed intermolecular coupling of 2-haloallylic acetates with simple phenols, and sequential formation of benzofuran derivatives through the intramolecular cyclization
synthesis of 2-substituted benzofuran derivatives by the palladium-catalyzed reaction of 2-haloallylic acetates with simple phenols in the presence of a base. The reaction proceeded through the intermolecular attack of the nucleophile on the central carbon atom of the π-allyl group, carbon-halogen bond cleavage, and sequential intramolecularcyclization.
.alpha.-Keto dianion precursors via conjugate additions to cyclic .alpha.-bromo enones
作者:Conrad J. Kowalski、Ann E. Weber、Kevin W. Fields
DOI:10.1021/jo00147a008
日期:1982.12
Trifluoromethylation of Alkenyl Bromides and Iodides (Including 5-Iodouracils) with (CF<sub>3</sub>)<sub>2</sub>Hgand Cu (“Trifluoromethylcopper”)<sup>1</sup>
作者:Ireneusz Nowak、Morris J. Robins
DOI:10.1021/jo062544a
日期:2007.3.1
[GRAPHIC]Bromo- and iodoalkenes undergo trifluoromethylation efficiently in DMA with "CF3Cu" generated from (CF3)(2)Hg and Cu. Variable stereochemical inversion is observed with substrates having a gem-carbonyl group. Substrates having gem-hydrogen, -alkyl, or -alkenyl groups give products with stereochemical retention.
Palladium-Catalyzed Double Substitution of 3-Aryl-2-fluoroallyl Acetates with Phenols via C–F Bond Activation
The double substitution of 3-aryl-2-fluoroallyl acetates with phenols has been accomplished; the Pd(PPh3)(4) catalyst system has effectively catalyzed the reaction to afford the doubly substituted product via carbon-fluorine bond activation.
Reactions of gem-dihalocyclopropanes with electrophilic reagents. Formation of allyl derivatives and (or) dienes