Sulfone Coupling and Double-Elimination Strategy for Carotenoid Synthesis
摘要:
A highly efficient synthetic method of carotenoid compounds has been developed on the basis of the sulfone coupling and double-elimination strategy. This method highlighted the sulfone-mediated coupling with the novel C-10 dialdehyde, 2,7-dimethyl-4-octenedial, which was easily prepared and efficiently utilized in the synthesis of the conjugated polyene chains.
Iron-Catalyzed Nucleophilic Substitution of Allylic Acetate
作者:Björn Åkermark、Magnus P. T. Sjögren
DOI:10.1002/adsc.200700372
日期:2007.12.10
The combination of diiron nonacarbonyl and dimethylamine gives an active catalyst for displacement of allylic acetate by diethyl methylmalonate. It was found that among a series of amines, only dimethylamine and morpholine were efficient promoters of the reaction. Solvents such as dimethylformamide (DMF) and N-methylformamide were much superior to tetrahydrofuran, dichloromethane, and ethanol.
Palladium-catalyzed allylic substitution reaction: oxidative addition versus dissociation in an olefin–palladium(0) complex
作者:Ko Tsurugi、Nobuyoshi Nomura、Keigo Aoi
DOI:10.1016/s0040-4039(01)02175-x
日期:2002.1
The reaction behavior of a transient olefin-palladium(0) complex after the first allylation was studied. Highly efficient palladium-catalyzed cascade double alkylation of a diallylic substrate is achieved by tuning the ligands. As a result, bidentate ligands which could form cyclic catalysts with a four-methylene bridge between two phosphorus atoms were effective for high selectivity and catalytic activity. (C) 2002 Elsevier Science Ltd. All rights reserved.
Khachatryan,L.A. et al., Journal of Organic Chemistry USSR (English Translation), 1975, vol. 11, p. 32 - 39