Chemistry of novel compounds with a multifunctional carbon structure. 5. Molecular design of versatile building blocks for aliphatic monofluoro molecules by manipulation of multifunctional carbon structure
A polystyrene-supported 9-amino(9-deoxy)epi quinine derivative for continuous flow asymmetric Michael reactions
作者:Javier Izquierdo、Carles Ayats、Andrea H. Henseler、Miquel A. Pericàs
DOI:10.1039/c5ob00325c
日期:——
derivative catalyzes Michael reactions affording excellent levels of conversion and enantioselectivity using different nucleophiles and structurally diverse enones. The highly recyclable, immobilized catalyst has been used to implement a single-pass, continuous flow process (residence time: 40 min) that can be operated for 21 hours without significant decrease in conversion and with improved enantioselectivity
作者:Béatrice Quiclet-Sire、Isabelle Thévenot、Samir Z. Zard
DOI:10.1016/0040-4039(95)02001-2
日期:1995.12
Heating γ-nitroketoncs bearing an electron-withdrawing group such as an ester geminal to the nitro group with formamidinesulfinic acid and triethylamine in isopropanol produces pyrroles in good yield.
Formation of γ-Oxoacids and 1<i>H</i>-Pyrrol-2(5<i>H</i>)-ones from α,β-Unsaturated Ketones and Ethyl Nitroacetate
作者:Maialen Aginagalde、Tamara Bello、Carme Masdeu、Yosu Vara、Ana Arrieta、Fernando P. Cossío
DOI:10.1021/jo101388x
日期:2010.11.5
Michael addition of ethyl nitroacetate on α,β-unsaturatedketones followed by Nef oxidation under hydrolytic conditions yields γ-oxoacids instead of the corresponding α,δ-dioxoesters. A concerted decarboxylation step is proposed on the basis of computational results. Finally, conversion of the γ-ketoacids thus prepared into 1H-pyrrol-2(5H)-ones by reaction with primary amines under Paal−Knorr conditions
Enantioselective organocatalytic conjugate addition of α-nitroacetate to α,β-unsaturated ketones in water
作者:Hyoung Wook Moon、Dae Young Kim
DOI:10.1016/j.tetlet.2010.03.105
日期:2010.5
catalytic enantioselectiveconjugateaddition reaction of α-nitroacetate to α,β-unsaturated ketones promoted by chiral bifunctional organocatalysts is described. The treatment of α-nitroacetate to α,β-unsaturated ketones under aqueous-phase reaction conditions afforded the corresponding Michael adducts with high enantioselectivity. The conjugateaddition adducts are easily converted to chiral δ-keto nitroalkanes