[CH2:1]([O:3][C:4](=[O:15])[CH2:5][C:6]([C:8]1[CH:13]=[CH:12][CH:11]=[C:10]([F:14])[CH:9]=1)=O)[CH3:2].[N+:16]([C:19]1[CH:25]=[CH:24][C:22]([NH2:23])=[CH:21][CH:20]=1)([O-:18])=[O:17].Cl.[N+]([C:30]1C=CC(N)=C[CH:31]=1)([O-])=O>C(O)CCC>[CH2:1]([O:3][C:4](=[O:15])[CH:5]=[C:6]([NH:23][C:22]1[CH:24]=[CH:25][C:19]([N+:16]([O-:18])=[O:17])=[CH:20][CH:21]=1)[C:8]1[CH:13]=[CH:12][CH:11]=[C:10]([F:14])[CH:9]=1)[CH2:2][CH2:30][CH3:31]3-(3-Fluorophenyl)-3-oxo-propionic acid ethyl ester, 106.3 grams (0.506 moles), 4-nitro-aniline, 63.0 grams (0.456 moles), and 4-nitro-aniline hydrochloride 4.0 grams (0.023 moles) were placed in a dry 2 L round-bottom flask. To the mixture was added 1.3 L of n-butanol, the flask was fitted with a Soxhlet extractor (cup volume of 0.3 L), condenser and nitrogen inlet. Dry, activated 4 Å sieves (200 grams) were placed in the extractor cup and the reaction mixture heated to reflux at 118° C. under nitrogen and maintained at that temperature for 90 hours. The reaction mixture was decanted while hot from a small amount of solids and chilled to −15° C. for 48 hours Crystalline solids were collected by vacuum filtration. The crystals were washed with 0.2 L of cold ethanol and two 0.2 L portions of hexanes and vacuum dried at 50° C. overnight to yield 35.8 grams (20.8% yield) of the title compound.
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