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.
of new chiral N -phosphinyl β-enamino esters and amides were successfully prepared with excellent Z -stereoselectivity ( Z / E > 99:1 in nearly all cases). Group-assisted purification chemistry proved to be an efficient method for the asymmetric reduction of the resulting β-enamino esters/amides to give enantiopure β-amino esters/amides. The asymmetric reduction can be controlled efficiently by using
A Palladium-Catalyzed Carbonylative-Deacetylative Sequence to 1,3-Keto Amides
作者:Dennis U. Nielsen、Signe Korsager、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1002/adsc.201400545
日期:2014.11.24
AbstractAn efficient three‐component reaction involving carbon monoxide with a range of aryl bromides and N‐substituted acetoacetamides is reported for the synthesis of β‐keto amides. This transformation is promoted by Pd‐catalysis followed by an acid‐mediated deacetylation upon work‐up, enabling a large number of β‐keto amides to be isolated. Finally, d2‐13C‐dyclonine could be synthesized in three steps utilizing the developed catalytic system as the key step.magnified image