[2+2] Photocycloadditions and Photorearrangements of 2-Alkenylcarboxamido-2-cycloalken-1-ones
作者:Catherine Meyer、Olivier Piva、Jean-Pierre Pete
DOI:10.1016/s0040-4020(00)00366-5
日期:2000.6
photolysis of 2-alkenylcarboxamido-2-cycloalken-1-ones led regio- and stereospecifically to a faster [2+2] intramolecular reaction and therefore to the corresponding cyclobutanes. However, photorearrangements involving three different intramolecular H-abstraction processes, compete with the observed cycloaddition. To explain the results, we propose that different deactivation pathways are available
Herein, we report the development of ruthenium-catalysed cross-couplingreaction of β-ketoamides as alkenyl electrophiles with organoboronates. This reaction presumably proceeds via the cleavage of the alkenyl C–N bond of the β-enaminoamide, which is generated in situ from the β-ketoamide and pyrrolidine, and is promoted by a nearby amide directing group and a ruthenium catalyst.
LABELLE, M.;GRAVEL, D., J. CHEM. SOC. CHEM. COMMUN., 1985, N 3, 105-106
作者:LABELLE, M.、GRAVEL, D.
DOI:——
日期:——
Aerobic α-hydroxylation of β-keto esters and amides by co-catalysis of SmI3 and I2 under mild base-free conditions
作者:Shun-Ming Yu、Kai Cui、Fei Lv、Zhen-Yu Yang、Zhu-Jun Yao
DOI:10.1016/j.tetlet.2016.05.052
日期:2016.6
A clean base-free α-hydroxylation of β-keto esters and amides has been developed, in which air was used as the oxygen source and SmI3 and I2 were applied as the catalysts, affording the corresponding α-hydroxylated 1,3-dicarbonyl products in good to excellent yields undermildconditions. Mechanism discussion shows that both oxygen atoms of dioxygen are utilized and incorporated into the product through
A highly efficient and facile catalyst- and solvent-free one step amidation of β-ketoesters, without using any additional reagents, is described. Therefore, β-ketoamides are obtained in good to excellent yields by condensation of β-ketoesters with various primary or secondary amines. This eco-friendly protocol has been developed under microwave irradiation.