[C:1]([O:7][CH:8]([CH2:10][CH3:11])[CH3:9])(=[O:6])[CH2:2][C:3]([CH3:5])=[O:4].[N+:12]([C:15]1[CH:16]=[C:17]([CH:20]=[CH:21][CH:22]=1)[CH:18]=O)([O-:14])=[O:13].N1CCCCC1.O>C1C=CC=CC=1.C(O)(=O)C>[N+:12]([C:15]1[CH:16]=[C:17]([CH:18]=[C:2]([C:3](=[O:4])[CH3:5])[C:1]([O:7][CH:8]([CH3:9])[CH2:10][CH3:11])=[O:6])[CH:20]=[CH:21][CH:22]=1)([O-:14])=[O:13]A solution of sec-butyl acetoacetate (5.0 g, 0.031 moles), 3-nitrobenzaldehyde (4.7 g, 0.031 moles), 0.5 ml of piperidine and 0.5 ml of acetic acid in 50 ml of benzene was heated at reflux for one hour collecting 1 eq. of water. The cooled solution, in ethyl acetate, was washed with sodium hydrogen carbonate, potassium hydrogen sulfate and brine, dried and evaporated to give 9.2 g of the title A compound as a dark oil.
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