Catalytic enantioselective conjugate addition of aromatic amines to fumarate derivatives: asymmetric synthesis of aspartic acid derivatives
作者:Seung Hee Kang、Young Ku Kang、Dae Young Kim
DOI:10.1016/j.tet.2009.05.037
日期:2009.7
The catalytic enantioselective conjugateaddition of aromaticamines to fumarate derivatives promoted by chiral palladium complexes is described. Treatment of aniline derivatives with fumaryl pyrrolidinone as Michael acceptor under mild reaction conditions afforded the corresponding chiral aspartic acidderivatives with excellent enantiomeric excesses (83–96% ee).
A new method for the aziridination of electron-deficient olefins using an N-chloro-N-sodio carbamate is described; the reaction was promoted by phase-transfer catalysis (solid–liquid) and afforded aziridines from α,β-unsaturated ketones, esters, sulfones and amides.
Chiral 2,2′-Binaphthyldiimine–Nickel(II) Complexes as Lewis Acid Catalysts for Enantioselective Diels–Alder Reactions
作者:Hiroyuki Suga、Akikazu Kakehi、Masashi Mitsuda
DOI:10.1246/bcsj.77.561
日期:2004.3
The preparation and application of a novel class of chiral Lewisacid catalysts based on chiral 2,2′-binaphthyldiimine ligands are described. Among the binaphthyldiimine–metal complexes tested, N,N...
Dialkylzinc mediated radical additions to chiral N-enoyloxazolidinones in the presence of benzaldehyde. Mechanistic investigation, structural characterization of the resulting γ-lactones
作者:Samantha Bazin、Laurence Feray、Nicolas Vanthuyne、Michèle P. Bertrand
DOI:10.1016/j.tet.2005.02.042
日期:2005.4
acid. The synthesis of sterically crowded trisubstituted γ-lactones was achieved through a multicomponent reaction involving t-butyl iodide and benzaldehyde in addition to the above mentioned reagents. The domino process includes successively: iodine atom transfer, radical addition, homolytic substitution at zinc, aldol condensation, and lactonization. The diastereoselectivity of the reaction and the
DCC/DMAP-Mediated Coupling of Carboxylic Acids with Oxazolidinones and Thiazolidinethiones
作者:Carlos Kleber Andrade、Rafael O. Rocha、Otilie E. Vercillo、Wender A. Silva、Ricardo Alexandre Matos
DOI:10.1055/s-2003-42117
日期:——
Dicyclohexylcarbodiimide and catalytic dimethylaminopyridine were successfully used in the coupling of carboxylic acids with oxazolidinones and thiazolidinethiones. The acylated products were obtained in good yields.