Hydrogenation of β-N-substituted enaminoesters in the presence of ruthenium catalysts
摘要:
beta-Aminoesters were prepared in two simple steps from beta-ketoesters derivatives and primary amines under mild conditions. Their hydrogenation was performed at 50 degrees C in the presence of several organometallic catalysts under acidic conditions. The new beta-N-substituted aminoesters were isolated in moderate to good yields. (C) 2010 Elsevier B.V. All rights reserved.
Bimetallic Ag–Cu alloy nanoparticles as a highly active catalyst for the enamination of 1,3-dicarbonyl compounds
作者:Lipeeka Rout、Aniket Kumar、Rajendra S. Dhaka、Priyabrat Dash
DOI:10.1039/c6ra04569c
日期:——
Bimetallicnanoparticles, particularly those based on copper, have recently attracted a great deal of attention for the development of low cost and highlyactive catalysts due to the synergistic interaction between individual metal components. In this work, bimetallic Ag–Cu alloynanoparticles were explored as a highlyactive and reusable catalyst for the enamination of 1,3-dicarbonyls using diverse
Catalyst- and solvent-free mechanochemical synthesis of isoxazoles from N-hydroxybenzimidoyl chlorides and enamino carbonyl compounds
作者:Hui Xu、Guang-Peng Fan、Zi Liu、Guan-Wu Wang
DOI:10.1016/j.tet.2018.09.044
日期:2018.11
A regioselective, solvent-free and catalyst-free synthesis of isoxazoles has been successfully developed under ball milling conditions. Milling the mixtures of N-hydroxybenzimidoyl chlorides and enamino carbonyl compounds in a ball mill at a frequency of 14.6 Hz for 20–60 min afforded isoxazoles in up to 86% yields. A possible reaction mechanism leading to the formation of the observed isoxazoles is
Various 1-and 2-substituted and 1, 2-fused 1, 4-dihydropyridine-5-phosphonate derivatives were designed and synthesized as analogues of 1, 4-dihydropyridine-3, 5-dicarboxylate, and their antihypertensive activities were examined. Several compounds proved to be equal or superior to nifedipine in lowering blood pressure in normotensive and spontaneously hypertensive rats. Among these compounds, 1-substituted 1, 4-dihydropyridine derivatives showed potent antihypertensive activities. The structure-activity relationships are discussed.
An efficient, one-pot synthetic protocol toward α-alkylidene-γ-butyrolacton-2-ones, a rather unexplored class of heterocyclic scaffolds starting from primary amines, methyl acetoacetate, and chloroacetyl chloride is described. The mixture of MeCN-MeOH as a polar solvent triggers a new cycloaddition of the enaminone intermediate. The reaction is completed within 12 hours under reflux condition to produce the title compounds.