A carboxylate-directed palladium-catalyzed Mizoroki–Heck alkenylation of γ,δ-unsaturated carboxylic acids with alkenyl bromides is reported. This carboxylate group is effective for chelation to a Pd center, enabling the distal alkenylation of electronically unbiased internal alkenes in the formation of conjugated 1,3-dienes with high stereoselectivity. In addition, the conjugated 1,3-diene products
Temperature-dependent alkylation of .gamma.-phenyl .beta.,.gamma.-unsaturated acid and ester systems in hexamethylphosphoric triamide-tetrahydrofuran solutions using lithium diisopropylamide
作者:Reinout H. Van der Veen、Hans Cerfontain
DOI:10.1021/jo00203a011
日期:1985.2
A sulfur-containing diselenide as an efficient chiral reagent in asymmetric selenocyclization reactions
Treatment of the di-2-[(IS)-1-(methylthio)ethyl]phenyl diselenide with bromine and silver triflate afforded the corresponding selenyl triflate which was used in situ as a strongly electrophilic selenium reagent to effect the asymmetric synthesis of oxygen- or nitrogen-containing heterocycles. Cyclic ethers, lactones, lactams or N-protected pyrrolidines have been prepared in good yield with complete regioselectivity and high diastereoselectivity. (C) 2001 Elsevier Science Ltd. All rights reserved.
742. Studies in decarboxylation. Part I. The mechanism of decarboxylation of unsaturated acids
作者:D. B. Bigley
DOI:10.1039/jr9640003897
日期:——
Julia,M. et al., Comptes Rendus des Seances de l'Academie des Sciences, Serie C: Sciences Chimiques, 1967, vol. 264, p. 330 - 332