An Efficient Organocatalytic Method for Highly Enantioselective Michael Addition of Malonates to Enones Catalyzed by Readily Accessible Primary Amine-Thiourea
作者:Krzysztof Dudziński、Anna M. Pakulska、Piotr Kwiatkowski
DOI:10.1021/ol3019055
日期:2012.8.17
A practical and highlyenantioselectiveMichaeladdition of malonates to enones catalyzed by simple and readily available bifunctional primary amine-thiourea derived from 1,2-diaminocyclohexane is reported. The addition of weak acids and elevated temperature (ca. 50 °C) improved the efficiency of the Michael reaction. This approach enables the efficient synthesis of 1,5-ketoesters with good yields
A base-free, recyclable approach for the conjugate addition of aliphaticnitro compounds to enones to give γ-nitro ketones is presented. Reactions are carried out in an ionic liquid with a basic anionic moiety, such as BmimNTf2, as the solvent, under mild conditions (25 °C for 24 h). The IL medium could be recycled several times without any appreciable loss of activity, after a simple extraction procedure
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
A series of substituted fused bicyclic imidazole derivatives, including benzimidazole derivatives and analogues thereof, being potent modulators of human IL-17 activity, are accordingly of benefit in the treatment and/or prevention of various human ailments, including inflammatory and autoimmune disorders.