Rauhut–Currier type homo- and heterocouplings involving nitroalkenes and nitrodienes
作者:Pramod Shanbhag、Pradeep R. Nareddy、Mamta Dadwal、Shaikh M. Mobin、Irishi N. N. Namboothiri
DOI:10.1039/c0ob00062k
日期:——
Reaction of nitroalkenes or nitrodienes with methyl vinyl ketone (MVK) or acrylate in the presence of the imidazole–LiCl catalyst system provides Rauhut–Currier (vinylogous Morita–Baylis–Hillman) adducts in moderate yield. Under similar conditions (imidazole–hydroquinone), nitroalkenes and nitrodienes undergo self-dimerization to afford the Rauhut–Currier adducts in varying yields. An alternative
A tandem Michael addition–cyclization of nitroalkenes with 1,3-dicarbonyl compounds was developed using phase transfer catalyst (PTC), allowing for the synthesis of polysubstituted-[4,5]-dihydrofuran in high yields. A wide range of substrates were demonstrated by this one-step process. Meanwhile, nitrogroup was substituted to form corresponding nitrite ion detected in the aqueous phase providing a
Highly Enantioselective Michael Addition of Aromatic Ketones to Nitrodienes and the Application to the Synthesis of Chiral γ-Aminobutyric Acid
作者:Xin-Yan Wu、Xing-Tao Guo、Feng Sha
DOI:10.1055/s-0036-1588604
日期:——
oic acid. A highly enantioselective Michaeladdition of aromatic ketones to α,β,γ,δ-unsaturated nitro compounds is described. In the presence of a chiral primary amine-thiourea based on dehydroabietic amine, γ-nitro ketones were obtained in excellent enantioselectivities (up to 95% ee) with up to 95% yield. In addition, this methodology has been successfully applied in the asymmetric synthesis of chiral