Nucleophilic addition to nitroacrylates: application towards the synthesis of 2,3-dehydroamino acids and 2,3-diamino acids
摘要:
The addition of the N-pronucleophiles to 2- or 3-nitro-2-alkenoates in the presence of base provided Michael addition products. In the case of 3-nitro compounds, reaction occurred via the formation of a-adducts and the subsequent elimination of nitrous acid to produce olefins with high Z stereoselectivity. 3-Phthalimido-2-nitrocinnamate adduct 8a was converted into 2,3-diamino ester 11a. (C) 2009 Elsevier Ltd. All rights reserved.
three‐component reaction to synthesize 1,4,5‐trisubstituted 1,2,3‐triazoles from readily available building blocks, such as aldehydes, nitroalkanes, and organic azides, is described. The process is enabled by an organocatalyzed Knoevenagelcondensation of the formyl group with the nitro compound, which is followed by the 1,3‐dipolar cycloaddition of the azide to the activated alkene. The reaction features an excellent
work being reported here, β-nitrostyrenes bearing an ethoxycarbonyl group at the β-position serve as scaffolds for the synthesis of α,β-difunctionalized alkenes. Nitrocinnamates undergo Michael addition reactions with versatile sp3- and sp2-nucleophiles such as alcohols, Grignard reagents, alkylcopper, and dialkylzinc to afford β-substituted nitroethane derivatives. However, various attempts to obtain
Asymmetric Michael Reaction of Aldehyde and β-Substituted α-Nitroacrylate Catalyzed by Diphenylprolinol Silyl Ether
作者:Daisuke Sakamoto、Yujiro Hayashi
DOI:10.1246/cl.180273
日期:2018.7.5
The asymmetric Michael reaction of an aldehyde and β-substituted α-nitroacrylate, catalyzed by diphenylprolinol silyl ether, was successfully carried out and good yield was achieved. This reaction has broad substrate generality. Moreover, the product can be easily converted to pyrrolidine or lactone.
methylene compound such as nitroacetate, 1,3-dicarbonylcompound, or α-nitroketone, and the following ring closure afforded functionalized heterocyclic frameworks. The reaction of cinnamate with nitroacetate occurs via nucleophilic substitution of a nitro group by the O-attack of the nitronate, which results in isoxazoline N-oxide. This protocol was applicable to 1,3-dicarbonylcompounds to afford
Water-compatible Cascade Reaction: An Efficient Route to Substituted 2,3-Dihydrofurans
作者:Ya-Ru Zhang、Fang Luo、Xu-Jiao Huang、Jian-Wu Xie
DOI:10.1246/cl.2012.777
日期:2012.8.5
A highly efficient domino Michael addition–alkylation reaction of 1,3-dicarbonyl derivatives with 2-nitroacrylates was developed in water. The procedure tolerates a series of functional groups such as methoxy, bromo, chloro, and heteroaromatic groups, providing three types of 2,3-dihydrofuran derivatives in moderate to good yields.