In a 1,4-addition reaction, a nucleophile adds to the β-carbon of a conjugated carbonyl compound, resulting in the formation of a new carbon-carbon bond. In the context of your question, this reaction involves the addition of a β-keto ester to a nitroalkene.
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(1S)-1-[(1R)-1-(4-chloro-phenyl)-2-nitro-ethyl]-2-oxo-cyclopentanecarboxylic acid methyl ester
(S)-3-[bis(isopropoxycarbonyl)methyl]cyclohexanone
4α-benzylthio-19-hydroxy-5α-androstane-3,6,17-trione
