Stereoselective Rearrangement of β-Hydroxy-<i>N</i>-acyloxazolidin-2-ones to Afford<i>N</i>-2-Hydroxyethyl-1,3-oxazinane-2,4-diones
作者:Steven D. Bull、Fred J. Feuillet、D. Gangani Niyadurupola、Rachel Green、Matt Cheeseman
DOI:10.1055/s-2005-865212
日期:——
Zinc alkoxides of syn- or anti-β-hydroxy-N-acyloxazolidin-2-ones undergo stereoselective rearrangement to afford their corresponding syn- or anti-N-2-hydroxyethyl-1,3-oxazinane-2,4-diones in good yield.
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
One-pot dehydrogenation of carboxylic acid derivatives to α,β-unsaturated carbonyl compounds under mild conditions
作者:Jun-ichi Matsuo、Yayoi Aizawa
DOI:10.1016/j.tetlet.2004.11.106
日期:2005.1
Carboxylic acidderivatives such as N-acyl-2-oxazolidones, δ-lactones, and δ-lactams were smoothly dehydrogenated to the corresponding α,β-unsaturatedcarbonylcompounds in one-pot manner at −78 °C just by treating their lithium enolates with N-tert-butylbenzenesulfinimidoyl chloride.
Enantioselective α-Arylation of <i>N</i>-Acyloxazolidinones with Copper(II)-bisoxazoline Catalysts and Diaryliodonium Salts
作者:Aurélien Bigot、Alice E. Williamson、Matthew J. Gaunt
DOI:10.1021/ja206047h
日期:2011.9.7
A new strategy for the catalytic enantioselective α-arylation of N-acyloxazolidinones with chiral copper(II)-bisoxazoline complexes and diaryliodoniumsalts is described. The mild catalytic conditions are operationally simple, produce valuable synthetic building blocks in excellent yields and enantioselectivities, and can be applied to the synthesis of important nonsteroidal anti-inflammatory agents
Enantioselective α-Arylation of Carbonyls via Cu(I)-Bisoxazoline Catalysis
作者:James S. Harvey、Scott P. Simonovich、Christopher R. Jamison、David W. C. MacMillan
DOI:10.1021/ja206050b
日期:2011.9.7
The enantioselective alpha-arylation of both lactones and acyl oxazolidones has been accomplished using a combination of diaryliodonium salts and copper catalysis. These mild catalytic conditions provide a new strategy for the enantioselective construction and retention of enolizable alpha-carbonyl benzylic stereocenters, a valuable synthon for the production of medicinal agents.