Organocatalytic Michael addition of aldehydes to trisubstituted nitroolefins
作者:Leilei Wang、Xiaojing Zhang、Dawei Ma
DOI:10.1016/j.tet.2012.05.088
日期:2012.9
to be effective to catalyze the Michael addition of aldehydes to 3-substituted 3-nitroacrylates. The reaction provided syn,anti-Michael adducts with good diastereoselectivity and excellent enantioselectivity. Some β-aryl and α-methyl substituted nitroolefins also worked under these conditions, although prolonging reaction time was required. These adducts could be used for assembling 2,3,4-trisubstituted
A variety of primary and secondary amines give the conjugate reaction with β-nitroacrylates, via an anti-Michael addition, without any catalyst and/or solvent, allowing good yields of β-nitro-α-amino esters.
We report, a new synthetic approach to β-nitroacrylates by dehydration of the corresponding nitroalkanols, under fully heterogeneous conditions and with low resource consumption.
Visible‐Light‐Driven Photocatalyst‐Free Preparation of (
<i>Z)</i>
β‐Nitroacrylate Isomers
作者:Muhammad Ehtisham Ibraheem Khan、Lorenzo Di Terlizzi、Stefano Protti、Alessandro Palmieri
DOI:10.1002/ejoc.202200635
日期:2022.7.14
A new easy and efficient protocol for synthesizing poorly available (Z) β-nitroacrylates through visible-light driven conversion of the corresponding (E) isomers is reported. The process can be profitably performed under both batch and flow conditions.
报道了一种通过相应 ( E ) 异构体的可见光驱动转换来合成低效 ( Z ) β-硝基丙烯酸酯的简单有效的新方案。该过程可以在分批和流动条件下有利地进行。
More Chips to Nitroolefins: Decatungstate Photocatalysed Hydroalkylation Under Batch and Flow Conditions
hydroalkylation of nitroalkenes and β-nitroacrylates via a photocatalytic strategy has been optimised under both batch and continuous flow conditions. This target has been achieved by exploiting the potentialities of the decatungstate anion as a versatile hydrogen atomtransfer (HAT) photocatalyst for the generation of alkyl radicals from aliphatic heterocycles, amides and cycloalkanes.