Selective reductive coupling of nitro aliphatic compounds with aldehydes in hydrogen using gold catalyst
作者:Larisha Cisneros、Pedro Serna、Avelino Corma
DOI:10.1016/s1872-2067(16)62493-2
日期:2016.10
Nitrones were synthesized in good yields directly from nitro aliphatic compounds, aldehydes, and H 2 using highly dispersed gold nanoparticles on titania. The high selectivity for nitrone synthesis contrasts with the platinum supported on carbon and corresponds to an increase from roughly 50% to 90%. The catalytic performance is tuned by precise control of the struc-ture of the active sites, the characteristics
使用高度分散的金纳米粒子在二氧化钛上直接从硝基脂肪族化合物、醛和 H 2 合成了高产率的硝酮。硝酮合成的高选择性与碳负载铂形成对比,对应于从大约 50% 增加到 90%。通过精确控制活性位点的结构、载体的特性和反应条件来调节催化性能。
Selective Reductive Coupling of Nitro Compounds with Aldehydes to Nitrones in H<sub>2</sub>Using Carbon-Supported and -Decorated Platinum Nanoparticles
作者:Larisha Cisneros、Pedro Serna、Avelino Corma
DOI:10.1002/anie.201402878
日期:2014.8.25
Nitrones were synthesized in high yields directly from nitro compounds, aldehydes, and H2 usingcarbon‐decorated platinum nanoparticles. The high selectivity for nitrone synthesis contrasts that of common supported metal catalysts and corresponds to an increase from roughly 6 to 97 %. The catalytic performance is tuned by precise control of the structure of the active sites and the characteristics
Calcium catalyzed Mukaiyama–Mannich addition of silyl enol ethers to nitrones
作者:Elizabeth A. Congdon、Kristine A. Nolin
DOI:10.1016/j.catcom.2016.02.003
日期:2016.4
A method for synthesizing β-(silyloxy)amino carbonyls through the addition of ketone-derived silylenolethers to N-phenyl nitrones has been developed. The transformation is catalyzed by a commercially available calcium(II) complex affording β-(silyloxy)amino carbonyls in good to excellent yield.
Copper(I)-Catalyzed Three Component Reaction of Sulfonyl Azide, Alkyne, and Nitrone Cycloaddition/Rearrangement Cascades: A Novel One-Step Synthesis of Imidazolidin-4-ones
作者:Kayambu Namitharan、Kasi Pitchumani
DOI:10.1021/ol202164x
日期:2011.11.4
A novel one-pot azide-alkyne/ketenimine-nitrone cycloaddition sequence that is induced by copper(I) and allows the transformation of sulfonyl azides, alkynes, and nitrones to highly substituted imidazolidin-4-ones is described. The corresponding heterogeneous version utilizing Cu(I)-modified zeolites as recyclable heterogeneous catalysts shows marginally improved yield and diastereoselectivity.
Copper-Catalyzed Synthesis of Polysubstituted Pyrroles through [3+1+1] Cycloaddition Reaction of Nitrones and Isocyanides
An efficient, copper-catalyzed [3+1+1] cycloaddition reaction was developed for the expedient synthesis of pharmacologically interesting polysubstituted pyrroles from easily available nitrones and α-acidic isocyanides. The given approach features a new mode of cycloaddition between nitrones and isocyanides with wide substrate scope, good functional group tolerance, and operational simplicity. The operando