Broadly Applicable Ytterbium-Catalyzed Esterification, Hydrolysis, and Amidation of Imides
作者:Céline Guissart、Andre Barros、Luis Rosa Barata、Gwilherm Evano
DOI:10.1021/acs.orglett.8b01896
日期:2018.9.7
An efficient, broadlyapplicable, operationally simple, and divergent process for the transformation of imides into a range of carboxylic acid derivatives under mild conditions is reported. By simply using catalytic amounts of ytterbium(III) triflate as a Lewis acid promoter in the presence of alcohols, water, amines, or N,O-dimethylhydroxylamine, a broad range of imides is smoothly and readily converted
Lewis acid promoted reactions of γ,γ-dialkoxyallylic zirconium species with various carbonyl compounds
作者:Hisanaka Ito、Azusa Sato、Takeo Taguchi
DOI:10.1016/j.tet.2005.09.009
日期:2005.11
The reactions of γ,γ-dialkoxyallylic zirconium species with carbonylcompounds in the presence of Lewisacid are reported. The reactivity of γ,γ-dialkoxyallylic zirconium species and reaction pathway were strongly dependent on the structure and electrostatic nature of the carbonylcompounds.
Enantioselective Aziridination of Alkenes with <i>N</i>-Aminophthalimide in the Presence of Lead Tetraacetate-Mediated Chiral Ligand
作者:Kung-Shou Yang、Kwunmin Chen
DOI:10.1021/ol0173073
日期:2002.4.1
[reaction: see text] Reaction of various N-enoyl oxazolidinones 5a-f with N-aminophthalimide and lead tetraacetate in the presence of camphor-derived chiral ligands provides the desired N-phthalimidoaziridines 6a-f in good to high enantiomeric excess (67-95% ee) at 0 degrees C within 15 min. The absolute stereochemistry of the corresponding aziridine derivatives was established by chemical correlations
In the presence of a Lewis acid (Et2AlCl), gamma,gamma-dialkoxyallylic zirconium species reacted with alpha,beta-unsaturated-N-acyloxazolidinone to give gem-dialkoxycyclopropane derivatives through 1,4-addition reaction. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.