A simple synthesis of 2,3-diketo amides from 3-keto amides
摘要:
The conversion of 3-keto amides to 2-(nosyloxy)-3-keto amides 4a-g followed by DBU-promoted, reductive elimination of p-nitrobenzenesulfinic acid provides a short, simple method for the preparation of 2,3-dioxo amides (tricarbonyl amides) 5a-f in high yields.
A simple synthesis of 2,3-diketo amides from 3-keto amides
摘要:
The conversion of 3-keto amides to 2-(nosyloxy)-3-keto amides 4a-g followed by DBU-promoted, reductive elimination of p-nitrobenzenesulfinic acid provides a short, simple method for the preparation of 2,3-dioxo amides (tricarbonyl amides) 5a-f in high yields.
Asymmetric Hydrogenations One by One: Differentiation of up to Three β-Ketocarboxylic Acid Derivatives Based on Ruthenium(II)–Binap Catalysis
作者:Rainer Kramer、Reinhard Brückner
DOI:10.1002/chem.200700527
日期:2007.11.5
beta-keto(alkyl esters) > beta-keto(oligofluoroalkyl esters). This is the first time that beta-ketoamides have been reduced asymmetrically (91 to >98 % ee) under such mild conditions. Monitoring the concentrations of these beta-ketocarboxyl acidderivatives and their respective hydrogenation products over the course of time showed that the most electron-rich substrate is captured by the catalyst preferentially
Method of preparing a polyamide acid composition for preparing polyimide
申请人:KANEGAFUCHI KAGAKU KOGYO KABUSHIKI KAISHA
公开号:EP0114059A2
公开(公告)日:1984-07-25
A polyamide acid composition for preparing a polyimide which is improved in the stability in a form of solution and can extend the pot life of the composition comprising a solution of a polyamide acid in an organic solvent, the polyamide acid being a precursor of the polyimide, and an N-substituted heterocyclic compound as a chemical treating agent which can lower a rate of conversion of the polyamide acid to the polyimide. The pot life can be extremely extended to give the composition an enough flowability for a long time without reducing the excellent properties such as a heat resistance of the obtained polyimide.
Synthetic transformations using arenesulfonyloxy groups, first as electrophiles, then as leaving groups
作者:Robert V. Hoffman
DOI:10.1016/s0040-4020(01)86369-9
日期:1991.1
US4515915A
申请人:——
公开号:US4515915A
公开(公告)日:1985-05-07
A simple synthesis of 2,3-diketo amides from 3-keto amides
作者:Robert V. Hoffmann、Douglas J. Huizenga
DOI:10.1021/jo00022a040
日期:1991.10
The conversion of 3-keto amides to 2-(nosyloxy)-3-keto amides 4a-g followed by DBU-promoted, reductive elimination of p-nitrobenzenesulfinic acid provides a short, simple method for the preparation of 2,3-dioxo amides (tricarbonyl amides) 5a-f in high yields.