These are compounds with a double bond between the α and β carbons, with an ester group attached. The 1,4-addition to this compound leads to the formation of a new carbon-carbon bond, which is essential for building the target molecule.
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(R)-(+)-3-Methyl-1-heptanol
methyl (1R*,2S*)-2-acetyl-4-cyclohexen-1-ylcarboxylate
tert-butyl (N)-benzyl(1-oxopropan-2-yl)carbamate
3-Pentenoic acid, 2,4-dimethyl-, phenylmethyl ester, (R)-
2,4-Pentadienoic acid, 5-phenyl-, ethyl ester, (Z,E)-
(E)-ethyl 3-(2-(3-(dibenzylamino)-3-thioxopropyl)phenyl)acrylate
ethyl (E)-5-(triphenylmethylthio)-2-pentenoate
